depth sounder for yachts

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Best depth sounder models from handheld to top of the range

Depth sounders are pretty crucial bits of kit for all of us. If you want to have an idea of how much water is beneath your keel then you will need a depth sounder of some sort - unless you want to go old school and send someone to the bow with a longline and weight...

The trend in recent years is towards boats running the vast majority of boat data through a chartplotter or Multi Function Display (MFD) but most of the best depth sounder models still come with a separate specific LCD display screen. The display itself is reasonably simple and the key concern is ease of use as well as brightness of the display and backlight functions. However, to get a depth reading you will need to fit a transducer into your boat.

When fitting a stand-alone depth sounder it sometimes comes with an in-hull transducer. These are mounted in a plastic tube and is fitted vertically to the inside of the hull. The tube contains some oil beneath the transducer itself which allows good sound transmission through the hull. If you fit a dual speed/depth transducer, or another type of through hull transducer, it will need to be mounted through a 50mm diameter hole in the hull.

Depth transducers transmit sound pulses or ‘pings’ that bounce back on hitting the seabed. The time the ping takes to travel down and return is a measure of the distance to the seabed. The only difference between so-called ‘analogue’ and ‘digital’ transducers is that, in the latter, the signal is sent out as data over a NMEA interface.

Best depth sounders available right now

Raymarine i50 depth sounder.

Best depth sounder for usability

The Raymarine i50 instruments are designed to complement Raymarine’s latest generation multifunction displays. The i50 comes in a number of different options. The i50 depth offers only a depth readout, while the i50 Tridata display offers speed and depth, while a measure log tracks distance sailed.

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Nasa marine clipper.

Best low cost depth sounder

Nasa has built a solid reputation for building marine electronics that work well, are affordable and simple to use. As such, NASA’s Clipper range is well known by now and trusted and is a particular favourite of small-to-medium-size boat owners. Whilst they might not be the flashiest instruments, they do a pretty good job and are available as stand-alone analogue devices for a very reasonable price.

The Clipper Depth looks somewhat dated, but the digits are very large and easy to read from a distance, which is more important than having a fancy trim. The supplied in hull depth transducer wires directly into the display head, offering a no-nonsense, easy to fit depth option without many bells and whistles.

Nasa Marine also provide a Clipper Duet option which comes with a through-hull transducer, enabling speed and depth measurements. Installation is slightly more complicated due to the through-hull transducer, but this is a very cheap way to get speed and depth onboard.

Reasons to buy: Great price, great reputation, simple to use

Reasons to avoid: Dated design

Buy Nasa Marine Clipper Depth from eBay

Buy Nasa Marine Clipper Duet from eBay

B&G Triton 2

Best top-end depth sounder

B&Gs Triton² provides sailors with a clear view of key instrument data such as speed, depth, wind and heading along with a dedicated SailSteer technology page. For the majority of these functions you will require further B&G kit, but given their position in the market as the go-to instrument supplier for serious racers it is hardly supposing they would expect users to be considering more than simply depth alone.

Combined with a Triton² Pilot Keypad, the display can also serve as a complete autopilot control system. The display is a low profile design, and offers an efficient LCD screen and easy installation makes it the perfect choice on cruising sailboats, or integrated within a full navigation system on cruising and racing boats.

You can buy Triton² display units with either a depth/speed though hull transducer or to take full advantage of the unit’s abilities with a depth/speed through-hull transducer and a wired wind pack all of which will allow the use of B&Gs SailSteer technology. The whole lot can also be purchased as a wireless package.

Reasons to buy: Clearly displays key instrument data, easy installation

Reasons to avoid: Relies a lot on further B&G kit at further expense

Buy B&G Triton² display from B&G

Buy B&G Triton² display from West Marine

Garmin GNX 20

Best depth sounder for customisation

The easy-to-read GNX 20 marine instrument display from Garmin displays black digits on a white background, or background in a variety of colours. It is able to display depth, speed, wind and 50-plus marine and boat parameters. Its glass-bonded display with anti-glare lens coating provides good daytime and nighttime readability with high-contrast digits scalable up to 36 mm.

Fully customisable user profiles allow you to choose from five available display configurations for sailboat or powerboat user-profiles: single, dual and triple function, plus gauge and graph mode to display wind, depth and speed data, or customise the pages to display the marine and boat data that is most important to you.

It’s NMEA2000 compatible and, as with many of the depth sounders in this list, is designed to work alongside a main MFD unit. To make the most of the functionality of the GNX 20 you will want a full functioning through-hull transducer, such as the DST 800 by Airmar.

Reasons to buy: Fully customisable profiles, easy-to-read

Reasons to avoid: To get full functionality you’ll require a through-hull transducer

Buy Garmin GNX 20 unit on Amazon

Buy Garmin GNX 20 unit on eBay

Plastimo Echotest depth sounder

Best for depth measurement without installing electronics

This handheld device requires no installation at all to your boat and is very simple to operate. It is totally waterproof and gives readings to a maximum depth of 80 metres. The Echotest has a Large LCD Display with LED back light, making it useable at night.

To use you need to dip the head into the water to see how much water is beneath you. It runs off a 9V drycell battery. This is certainly not the most accurate or best option if you have a larger boat but for those planning on a bit of dinghy cruising, or without power onboard it could offer a decent option.

Reasons to buy: Handheld so requires no operation

Reasons to avoid: Operation not the most accurate, not great for larger boats and requires a battery

Buy Plastimo Echotest depth sounder from Tradeinn.com

Best sonar systems on the market

If you want to go one step further in your understanding of what lies beneath, you may want to consider a forward-looking sonar unit . The latest models of marine sonars can be powerful tools for both cruising and racing yachts. Such has been the improvement that you can now get sufficient clarity to pick out areas of seagrass and patches of sand in an anchorage.

Broadly speaking, the improvement is thanks to the availability of CHIRP transducers that, unlike a traditional sonar, can distinguish between multiple targets through scanning using a signal of varying frequency. This enables them to show individual fish, rather than just indicate a shoal, to resolve vegetation growing on the seabed, and distinguish between a sandy/muddy shoreline and a rocky one.

B&G ForwardScan

B&G’s ForwardScan sonar has a 180kHz transducer, and can scan the seabed over a 15° arc up to 90m forward, but this can, and will, reduce depending on bottom conditions and water depth.

As well as showing a graph of the depth ahead of the boat, the ForwardScan data can also be superimposed on a chart, with shading to indicate safe, warning and critical depths, which makes it much more intuitive to use. ForwardScan uses a removable slimline transducer that extends 31mm below the hull.

The company offers a selection of models in the range, suitable for different purposes including a StructureScan transducer, which is geared towards fishing markets and to show more detail of the seabed.

Reasons to buy: Shows a full graph and can be superimposed on a char with shading

Reasons to avoid: Premium pricing, aimed at fishing markets

Buy B&G ForwardScan transducer from eBay

Echopilot FLS 3D

Echopilot’s range is optimised to show as much detail of the seabed as possible, rather than focussing primarily on displaying fish. It updates quickly and so, the manufacturer claims, can be used at speeds of up to 20 knots. This represents a significant boosts to old systems, which were only really usable at very low speeds or sub-5 knots.

A more powerful FLS 3D model has twin retractable 200kHz transducers that give a 60° beam width. The range extends to 20 times depth, so around 200m in 10m of water. Echopilot claims it can detect rocks at up to a distance of 500m. This more powerful offering does offer much more in terms of data readability. It does offer a three-dimensional picture of the ground ahead, and better accuracy from distance, but the price is greatly increased.

Reasons to buy: Can be used at speeds of 20 knots, the powerful 3D model gives around 200m coverage in 10m depths

Reasons to avoid: Very premium price

Buy Echopilot FLS 3D from MarineComponents

Garmin Panoptix

Many fishfinders, including many of Garmin’s own, show only the area below the boat or at the sides, but Garmin’s Panoptix products offers through-hull transducers intended for fitting to yachts and has forward-looking functionality.

The FrontVü mode displays the seabed ahead of the boat in impressive detail but as with the similarly detailed B&G offering, only at a range of up to 90m, reducing to eight to ten times the depth of water in very shallow water. The scanner has a 20° beam width and provides a clear picture at boat speeds of up to 8 knots.

The LiveVü Forward function allows you to see fish and the structure of the seabed at a reduced range of up to 30m. Both options are offered with the PS51-TH transducer at a cost of £1,360. This unit is a similar size to that of the B&G ForwardScan transducer.

Reasons to buy: Through-hull transducers with forward-looking functionality, LiveVii allows you to see fish and seabed structure at range of up to 30m

Reasons to avoid: Premium price

Buy Garmin Pantopix Livescope system from eBay

Didn’t find what you’re looking for? Head to Amazon’s dedicated boating page for more marine products.

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6 Best Sailboat Depth Finders

Best Sailboat Depth Finders | Life of Sailing

Last Updated by

Daniel Wade

June 15, 2022

When sailing, a depth finder is a must-have accessory if you want to enjoy yourself without worrying about hitting the bottom while out there on the water.

And even though they're all made to serve the same purpose, they're not made the same. It's, therefore, important to go for a depth finder that can offer you real-time updates to ensure that you stay safe at all times.

When it comes to sailing, you'll enjoy it a lot more if you're able to know the depth of the water where you're sailing at. But when you go on the internet in search of the best sailboat depth finders, it's unfortunate that you'll come across fish finders instead.

Well, this may not be totally surprising given that they both use sonar. However, if you're more concerned about the depth of the water, especially if you don't want to ground your sailboat, then going for the best sailboat depth finder is the wise thing to do.

In addition to using the sonar system, today's sailboat depth finders are designed with a lot of innovative technology and built-in features such as GPS and Wi-Fi. This is to ensure that the devices are more robust and can offer real-time updates on the depth of water where you're sailing at.

More important, it will help keep you and your sailboat safe and prevent it from grounding just because you unknowingly sailed in shallow waters.

The importance of a depth finder for your sailing is so immense and that's why there are a lot of depth finders in the market that choosing the best sailboat depth finder can feel overwhelming.

So instead of spending hours on end scouring the internet trying to find the right model for your sailing adventures, we've made it a lot easier for you. Here's a list of the best sailboat depth finders to help you make the most of your sailing escapades.

Table of contents

The Basics of a Depth Finder

It's of great importance to know the depth of the water you are sailing on and this is why you should always have a proper depth finder when going out there on the water. You do not want to run aground and perhaps risk damaging your precious boat just because you unknowingly sailed in shallow waters.

With a depth finder, you'll know the exact depth of your ailing area and also get notified when you are within shallow areas. As such, depth finders generally offer readings in feet and meters but can also offer readings in fathoms. The alarm should alert you of shallow areas, which is great for your safety and the safety of your boat.

If you're wondering whether or not you can use a fish finder for measuring depth, we have to note that dedicated depth finders can offer more accurate data than fish finders.

How to Choose the Best Sailboat Depth Finder

While most depth finders will offer accurate depth readings, you should always think about the extra features that you need in a depth finder. It's of great importance to take your time and look at the price ranges and narrow down to what you can afford that's if you're on a budget.

In addition to the features, you can also consider the warranty in place, the required features, the technology used, and ease of installation and use. You certainly do not want a device that's pretty difficult to mount on your boat or a device whose display will be hard to read in the sun or in low light conditions.

Other things such as portability, screen sizes, mountable options should be considered when choosing the best depth finder for you. With that in mind, we can tell you for sure that you'll be making a really solid choice if you choose any depth finder on this list. You should also go for a depth finder that can work perfectly even when the boat is moving at high speeds.

Here are the 6 best sailboat depth

1. HawkEye DepthTrax 1

For many sailors, depths that are greater than 200 feet aren't a concern to them since their sailboats aren't going to run aground in such depths. Instead, their main concern is about the accuracy of the readings and this is exactly what the HawkEye DepthTrax 1B brings to the table. This depth finder is engineered to provide precise depth readings from 2.5 feet to 200 feet. The best part of using this depth finder is that it will offer these exact readings as speeds of over 60 mph!

So even if you're moving so fast, it has a warning system that will ensure that you do not run your boat aground as it will warn you accordingly as you approach shallow areas. You can also adjust this device to offer the best depth readings for individual boats. All you have to do is program the keel offset function and you'll be good to go.

Its glare-free display makes it user-friendly as you can perfectly see the reading even in bright lights. Similarly, it's designed with a backlight that makes it a lot easier to read the display even in low light conditions. It also comes with a glue-in hull transducer and transom mount to make using it a lot easier.

‍ Offers accurate depth readings even when in high speed
It's very easy to use
The large display makes it user-friendly
It comes with 2 alarms that will let you know when you reach the depth you've set
It's durable and waterproof
‍ The reading may not be that accurate if there's an object under the water surface

2. Humminbird 407860-1 HDR650 Digital depth Gauge

As a well-known maker of some of the best fish finders, it's totally not surprising that the Hummin brands feature a number of times on this list. Even though the Humminbird 407860-1 HDR650 doesn't double up as a fish finder, it's a capable digital depth finder that provides instant readings even when the sailboat is on the move.

It's designed with a 200 kHz transom mount transducer as well as installation hardware to make it very easy to mount and use on the sailboat. Its color is so attractive and is designed in such a way that it complements the rest of this depth finder. The 1.25-inch display comes with a backlit that makes it's a lot easier to read and use even in low light conditions. The fact that it is digital enables it to show depth in various measurements such as feet, meters, and even fathoms! It also has an alarm that will warn you when your boat is about to hit shallow waters.

‍ The display is simple, clean, and easy to read
It's easy to mount on the boat
It offers very accurate depth readings
The shallow depths alarm keeps you alert when your boat is about to hit shallow depths
It's waterproof and fairly durable
It's affordable
‍ The transducer cord is short and may not perfectly reach the device

3. HawkEye D10DX In-Dash Depth Sounder

If you're looking for a depth finder that offers more than just depth readings, the HawkEye D10DX can be an ideal choice. In addition to offering accurate depth readings, this device can also measure the water and air temperatures. It also gives you the option of choosing between a thru-hull transducer and a transom-mounted transducer.

In terms of readings, this device is designed with a very large display that makes it easy to use and read even at night. The anti-glare feature of the display makes it superb in sunny conditions while the backlit feature makes it excellent in low light conditions. This device will never let you down even when you're sailing at a speed of 30 mph.

This device is also designed with special programming to mitigate any false reading that might occur. More importantly, it comes with a visual alarm that can alert you if you're about to hit shallow waters. In terms of water and air temperature, these features are great if you want to know the condition under which you're sailing.

This device is easy to install and comes with marine-standard electrical connectors to ensure that you're safe at all times.

‍ It's easy to install and use
It offers accurate depth readings
It offers additional water and air temperature readings
The alarm can alert you if you're about to hit shallow waters
It's waterproof and durable
You can choose between two transducers
‍ The readings can be inaccurate in dirty waters or muddy bottoms

4. Lowrance LST 3800

This superb depth finder is designed with an excellent transom mount transducer that provides accurate readings in up to 700 feet! It will also never disappoint you if your boat is going at a speed of about 50 mph. That's not all; this device can also provide temperature readings when out there on the water.

Its high contrast dot matrix screen comes with a backlit that makes it a lot easy to read in both low light conditions and in the glare of a hot sunny day. This device is designed with three main display pages that provide readings for depth, temperature, and dual display. The fact that you can control the displays with the three-button keypad makes it user-friendly.

This device also comes with an alarm system to notify you if your boat is almost hitting shallow waters. The readings can be offered in both meters and feet in terms of depth and Celsius and Fahrenheit in terms of temperature.

‍ It offers one of the best displays
It's easy to use
Offers both depth and temperature readings
It's easy to mount
Offers very accurate readings
‍ Not ideal for people whose primary concerns are depth readings only

5. Humminbird 409670-1 PiranhaMax 197C Color Fish Finder

Although it's a fish finder, this device can also be used as a super depth finder thanks to its multiple features such as a very large display that offers very accurate info that's easy to read both during the day and at night.

The best thing about this device is that it will offer accurate depth reading while showing the water temperatures as well as images of various objects and contours under the water. Thanks to its dual frequencies and down imaging, you'll get the idea of what's happening under your boat. Its 1600 watts of power is so powerful that you don't have to worry about its battery running out while you're out there on the water.

And like most depth finders, this device is designed with an intuitive alarm system that may give you a heads up as you approach shallow waters. This is a very versatile device that will serve you on your fishing , sailing, or diving escapades.

‍ Very versatile
Installation and ease of use are top-notch
The display is very clear both at night and during the day
The alarm system will alert you of shallow depths
‍ The fact that it comes with several features can be overwhelming to those who need a simple depth finder

6. Garmin Echo 551dv Worldwide with Transducer

This is an excellent depth finder that can also work as a basic fish finder. With a power peak of 4,000 watts, this device can easily offer accurate readings up to 2,300 feet, which is pretty outstanding. Designed with built-in HD-ID sonar, this device gives the option of either working with a transducer or even without it.

Thanks to its very large 5-inch QVGA colored display, the info is easy to read. This display can offer accurate readings of not just the depth but also the contours of the bottom as well as whatever object that's under the water. If you're interested in catching some fish, you can choose the fish icon to show the fish but you can choose to leave this option if you're interested in fishing so that it doesn't clutter the screen.

The alarm system is crucial in alerting you as you approach shallow depths. This is of great importance in keeping you safe and ensuring that your boat doesn't run aground. You can also look at the history to see the depths and details of where you have been before.

‍ Offers accurate depth readings
Can give you the option of finding fish
The alarm system can alert you as you approach shallow depths
It's easy to install and use
It also offers temperature readings
‍ You can set alarms at the depths you want
It offers too much information and not ideal if you want a simplistic depth finder

To this end, depth finders can be a game-changer even if you're a novice sailor. The initial investment might be big but you'll certainly come to appreciate the benefits that these devices offer. So if you've been looking for the best sailboat depth finder, choose any of the above-described models and you'll be good to go. If anything, you'll make more out of your sailing experience.

Happy sailing!

I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

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Practical Boat Owner

Digital edition

Best forward-looking sonar: 5 units tested

Ben Meakins
May 10, 2016

How effective is forward-looking sonar at flagging up shoals and obstacles on the seabed? David Pugh compares the findings from five devices

Would you like to be able to spot an obstacle before your boat hits it? Of course you would, and so would every other sailor in the world. Looking ahead is the Achilles’ heel of the conventional echo sounder , which can only tell you the depth of the water in which you are already floating. If you wait until the sounder reads zero, it’s too late. That’s where forward-looking sonar comes in.

Admittedly, the conventional sounder can tell you a lot, and in recent years plotters have started to display not only current depth, but also history via their fishfinder screens. It’s a fair bet that if the depth is steadily decreasing, the time will soon come to change course. But this approach only works in gently shoaling water: abrupt changes in depth could spell disaster.

Looking ahead

The traditional approach to looking ahead has always been to do so before you take your boat anywhere near a potential hazard. We do it all the time, using the chart and calling it passage planning. A good survey and a precise position has been the key to keeping boats off the rocks for years, but there are times when this isn’t an option. Some places are still poorly charted, and even in our well-surveyed UK waters there are moving shoals which defy the efforts of hydrographers and harbour buoyage.

One option is to jump in the dinghy with a leadline or sounding pole and carry our your own mini-survey beforehand. But if you’re nosing up a river and simply want an early warning of a shoal, or are nervous of finding the right spot to anchor in a rocky loch, wouldn’t it be nice if your echo sounder gave the depth ahead of the boat?

Best forward-looking sonar: What’s available ?

For years, the undisputed king of the niche market of forward-looking sonar has been Ringwood-based Echopilot. Various iterations of their forward-looking technology have sold all over the world, and their only historical competitor disappeared some time ago.

Now, however, things have changed. Navico, the parent company to Simrad, B&G and Lowrance, recently announced a forward sonar transducer and updated software for their SonarHub module and plotters, while Garmin have developed a version of their high-definition Panoptix fishfinder designed to look ahead. While Echopilot and Navico are in direct competition, the Garmin product is a little different, aiming to find fish at a limited range ahead of the transducer – they provide a version of the transducer designed to fit a trolling motor shaft to facilitate scanning around the boat. However, it does provide imagery of topographical features too, and hence could be of use in spotting hazards.

We gathered together five contenders: three from Echopilot and one each from Garmin and B&G, fitted them to an old 3.6m (12ft) dinghy and put them through their paces in Poole Harbour. We tried looking at a range of features, including solid piling, bridge piers, gently shelving beaches and mooring chains, as well as using the units to find our way down a narrow channel of soft mud.

Echopilot FLS 2D

A channel buoy’s chain, picked up at around 12m

The only unit tested with a dedicated display, the FLS 2D comes with a choice of transducers. The standard transducer is sold as suitable for smaller boats, has plastic encapsulation and uses a 45mm through-hull fitting. The ‘Professional’ transducer is a much heavier unit of bronze, costing an extra £170 and using a 60mm through-hull. Installation is simple – fit the transducer, plug it and the power cable into the back of the display and you’re done.

To display the information, Echopilot uses a screen showing a cross-section of the water ahead of the boat. On this are plotted the echoes received by the transducer, using colours graded from blue to red to show the strength of the echo (red being the stronger). By default, the unit is set to choose a range automatically, but the user can override this.

The user interface is not immediately intuitive, but once the unit is set up the most you are likely to need is to change the range, achieved simply enough using the ‘Up’ and ‘Down’ softkeys. There is an auto setting, which changes the range based on the depth, but in difficult conditions the manual setting is helpful.

On the water, we initially struggled to make sense of the display, but with practice the manner in which the data is shown and colour-coded to indicate the strength of the echo allows a significant level of interpretation from the user. For example, a mooring chain or stake will give a vertical line of strong, red returns with some weaker echoes either side. The red shows that you should pay attention despite there being relatively few data points. Soft mud, on the other hand, gives a scattering of weaker echoes as the sounder struggles to find the bottom, so the truth is likely to be a middle value.

We tested the range of the sounder by looking at a solid concrete wall. The wall was clearly visible at ranges just over 100m, which was the width of the channel in which we were working. Smaller targets such as mooring chains were harder to acquire, with the range typically less than 10m before we could say with confidence that the object was there. At this kind of range the narrow width of the transducer beam becomes obvious, so the bow needs to be held steadily on the target.

The seabed slopes down to the right, ending at a solid wall at 75m

In soft, shallow mud, the FLS 2D would become confused when in auto mode owing to some echoes being apparently very deep, requiring the range setting manually. This removed most of the spurious results and made the display useful once more, although the depths it recorded were clearly far too high.

Switching to the professional transducer resulted in a cleaner signal, but surprisingly a shorter range at just over 80m. The beam also appeared narrower, so on a small boat where the heading is not necessarily constant, the standard transducer is perhaps a better choice.

RRP: £1,179 / $1,569 (inc. standard transducer)

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Echopilot fls platinum engine.

Solid piling, visible at 90m on our range test

The FLS Platinum Engine comprises three components: the transducer, a sturdy bronze unit with a 60mm through-hull fitting, a transducer interface box and a video interface box. The video interface can output composite or S-video, suitable for viewing on a third-party plotter or external screen. Control is via an external keypad plugged into the video interface.

In operation, the Platinum engine is similar to the FLS 2D, with the data displayed in the same way. We used the composite video output, but it would pay to use S-video if possible to take advantage of its improved resolution.

Rocks at 32m. The scattering from the irregular shapes makes the return weaker, but there is clearly an obstacle

The transducer is identical in appearance to the Professional transducer for the FLS 2D so, perhaps unsurprisingly, our results were similar. Our range test picked up the wall at about 90m and, like the FLS 2D, it tended to show spurious depths in soft, shallow channels. It was, however, quicker to get back to normal once the boat moved out of the difficult area. We found it harder to pick up mooring chains and narrow objects with the Platinum engine, perhaps due to a narrower beamwidth from the transducer and the tendency of a small boat to yaw. It detected the multi-faceted rocks of some sea defences, albeit with a fairly scattered plot.

RRP: £1,000 (inc. transducer)

Buy it now on echopilot.com

Echopilot FLS 3D

A channel mark’s chain, appearing 30m away as a peak in the midst of deeper water

Echopilot’s flagship model, the FLS 3D, takes a different approach to the 2D products. By using two hefty 75mm through-hull units, each of which contains two angled transducers, the sounder can combine the data to display a 60° sector ahead of the boat.

The amount of data from four transducers would produce a confusing mess if displayed with no further processing, so Echopilot have included a computer in the system to render a surface which best fits the data, and output the video. As a result the system comprises three stages: the transducers, the transducer interface and the computer. From the computer, you can output VGA or DVI to a screen, or go through a converter for composite or S-video.

Like the 2D models, the picture is colour-coded to aid spotting the difference between shallow and deep water. This makes for a very intuitive picture, but a user needs to bear in mind that the surface displayed is similar to that which would be made if you were to drop a blanket over the seabed –spikes are smoothed into curved peaks and vertical walls become steep slopes.

On the water, the display is very easy to read, and we found it good for seeing continuous features such as channel edges. Our range test yielded a shorter range than the 2D sounders, with the wall ahead convincingly visible from about 35m. I suspect this may be due to there being insufficient data points for rendering until you are closer to the obstacle, while the 2D products show the data for the user to interpret.

Approaching a steep wall at about 15m. Water appears to exist beyond the wall

Another oddity when approaching the wall was that the sounder showed a depth of water continuing beyond it – not a problem, but something that takes getting used to.

The FLS 3D is primarily sold to larger boats, so our test in a narrow, shallow channel was perhaps unfair. Nevertheless, variations in depth consistent with the channel edge were visible, and had a shorter range than 40m been available would have been clearer. Heading down the edge of a deepwater channel, the edge was clearly defined and navigation mark chains appeared as steep peaks, suggesting that this would be a valuable tool for nosing up a river.

RRP: £9,550 / $13,000 (inc. 2 transducers)

B&G ForwardScan sonar

With simple structures like the wall, the danger is immediately obvious

As might be expected from a plotter manufacturer, this unit is designed to work with B&G’s own displays, removing the video interface element common to the Echopilot black box products. However, you will still need an interface box (SonarHub) to connect the transducer to the plotter. Once done, and with your software updated to suit, a new option will appear on the menu: ForwardScan. By default, this shows a shaded area designed to represent the seabed ahead of the boat – brown in our pictures, but you can change the colour pallette. Essentially, this is a line of best fit – the data points can be overlaid if you wish, either both above and below the line, or just above. These points are colour-coded in a similar fashion to the Echopilot plots.

ForwardScan in use

In its default state, just showing the line of best fit, the screen is easy and intuitive to read. On our range test, the sounder showed the steep wall at a maximum range of 65m. This is significantly shorter than the Echopilot, but turning on the data points showed evidence of the wall at around 80m – the software clearly needs more data points than the human eye to confidently predict the seabed.

Mooring chains are shown by the data, but ignored by the line

In shallow, muddy water the best-fit line lost its lock on the bottom, but turning on the data points again made the display useful, with the distribution giving an indication of whether the water was getting deeper or shallower ahead of the boat.

Because ForwardScan is integrated into an existing navigation package, it already has reliable depth information from a separate transducer, so is more resilient to scaling problems based on false readings than the Echopilot units. It also proved useful to be able to display the data alongside the chart, especially when moving along a channel edge.

In soft mud, the line of best fit fails, but data points still show trends

RRP: Transducer £540, SonarHub £470 / $1,079

Buy it now from eBay (UK)

Buy it now from eBay (US)

Garmin Panoptix Forward

RealVü scans from left to right to build a realistic image of the seabed. Here’s a wall at 14m

A single transducer, which plugs directly into the back of a compatible Garmin plotter using Ethernet, Garmin’s Panoptix Forward sonar product is more intended as a fishfinder for looking around your boat than as a device for spotting obstacles while under way.

The transducer comes with two mounts – one for the transom, the other to fit it to the shaft of a trolling motor, allowing it to rotate. The transducer itself is large (approx 170mm x 90mm) and dips below the transom at an angle of around 45°, so it is unsuitable for sailing craft in its current incarnation owing to drag. It also loses picture at speed, presumably owing to disturbed water around the transducer, while the Echopilot and B&G products can be successfully used on the move.

The plotter offers two forward views: LiveVü and RealVü 3D. LiveVü will look familiar to fishfinder users, with the classic blue screen and smeared lines, coloured to show the strength of the echo. RealVü scans a 60° arc ahead of the boat to build a picture of the seabed ahead, similar to the Echopilot 3D. However, unlike the Echopilot, which shows a picture all the time, RealVü scans, building the image from left to right.

A piece of rail marking a channel edge, viewed at 8m

The Vü ahead

Using LiveVü, the range is limited compared with the other products, the best we achieved on the solid wall being just under 40m. At close range, however, the system offers significantly more detail than any of the other products, suggesting that it operates at a higher frequency, trading range for detail.

This conclusion was borne out by a test we tried in the shallow waters of Poole’s Holes Bay, looking at a channel mark made from a piece of old railway rail. Both the Echopilot and Navico products showed this as a collection of a few echoes, while the Garmin showed a clear vertical obstacle at about 8m.

Shoaling depths are clearly shown

In RealVü mode, the range is reduced compared with LiveVü by the rendering facility – as you move away from a feature, the image begins to fragment as the quality of the data reduces. It’s also a bit slow, taking several seconds to build each picture before starting again. However, the image produced is realistic and detailed. Data points not used in the rendering are overlaid to give an indication whether any features have been ignored.

If RealVü could work faster and under way, it would make a great tool for exploring narrow channels.

RRP: £1,299 / $1,499 (transducer only)

PBO Verdict

If you’re looking to avoid collision, rather than carry out a close-range survey of the seabed, we have to discount the Garmin from the running. Its limited range and intolerance to turbulence make it unsuitable for use at anything more than trolling speeds, but if Garmin can produce a through-hull transducer that deals with these problems, its impressive level of detail makes it a product to keep an eye on in the future.

The Echopilot FLS 3D is best suited to larger boats, not least because of its size and cost. We also found it worked best in deeper water, where the ability to see for a significant angle either side of the bow proved extremely beneficial, picking up the edge of the shipping channel in Poole with a high level of detail.

For smaller boats, however, any of the 2D products would prove a useful addition to your instrumentation. ForwardScan is the most intuitive thanks to its line of best fit and is the obvious choice if you already have B&G, Simrad or Lowrance gear on board, but with practice I found that I preferred to see the raw data and draw my own conclusions – the approach used by Echopilot. In this mode, the Echopilot pictures were cleaner, with fewer spurious echoes either side of the true data. As the long-standing market leader in forward sonar, it’s perhaps to be expected that their filtering of the data might be better, and this seems to be the case.

Which of the Echopilot products you choose depends on personal considerations. The FLS 2D offers best value for money, and we found the standard, cheaper transducer to be perfectly adequate. The Professional transducer adds detail but is bulkier and heavier, with a greater protrusion below the hull. For a little extra cost, if you already have a plotter the Platinum Engine offered best performance across a range of conditions.

Whatever you choose, it’s important to remember that they aren’t infallible, and are affected strongly by the surface at which they are looking. All of them worked well in shoaling water, the plots clearly indicating reducing depth from a shelving beach. Soft mud and shallow water confused them all to a greater or lesser extent, as is only to be expected when you fire a sonar beam obliquely into a soft medium. Broken rock (used as sea defences for a marina) scattered the beams, confusing attempts at 3D rendering by the Garmin RealVü or Echopilot 3D, but visible as scattered dots on the other products. Plane surfaces or protrusions from the seabed worked better.

When I set up the test, Mike Phillips of Echopilot warned ‘it’s a bit like using radar. You have to get used to it’. He’s right, and like radar, forward sonar needs interpretation. Software can help, but a practised operator will get more from it than a novice. It doesn’t replace a chart or a good position, but teamed up with other information might just keep you off the rocks or putty, or help avoid that uncharted underwater obstruction.

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Yachting World
Digital Edition

Sonar and sounders: 4 new models that are good for more than just fishing

April 22, 2020

Developments in technology are now allowing us to see the shape and structure of the seabed, including vegetation, in increasingly clear detail. Rupert Holmes reports

sonar-echo-sounders-charal-bow-Credit-Vincent-Curutchet

Sonar has potential to help offshore racers like IMOCA 60s avoid submerged obstructions. Photo: Vincent Curutchet

Sonar and forward-looking depth sounders are often seen as the preserve of those whose primary interest is fishing. However, a huge amount of effort has been invested in these products over the past few years and the latest models can be powerful tools for both cruising and racing yachts . They offer sufficient clarity, for instance, to be able to pick out areas of seagrass and patches of sand in an anchorage.

Much of this improvement is thanks to the availability of CHIRP transducers that, unlike a traditional sonar, can distinguish between multiple targets through scanning using a signal of varying frequency. This enables them to show individual fish, rather than just indicate a shoal, to resolve vegetation growing on the seabed, and distinguish between a sandy/muddy shoreline and a rocky one.

For those of us who spend large periods of time in the Mediterranean during autumn months , when overcast skies or dark evenings can mean anchoring when it’s not possible to see the seabed, this could be a significant boon. As well as the obvious safety advantage, and convenience of being able to find sand at the first attempt, there’s also a benefit in avoiding damage to environmentally important seagrass beds.

Article continues below…

Forward-facing sonar: Everything you need to know

Yachting is usually pretty fast to embrace useful new technology, particularly if it helps win a race or if it…

augmented-reality-sailing-raymarine-axiom-xl

Can augmented reality really give us a vision of the future of sailing?

Google’s mission statement is ‘to organise the world’s information.’ This almost impossibly ambitious declaration of intent underpins the technology giant’s…

On yachts, we’re most interested in what lies roughly ahead of the boat, unlike fishing where a good picture of what’s directly underneath or to the side is often more important. This means not all transducers developed for the fishing market will work well for our purposes, but we’ve listed a selection here that could be useful.

Even so it’s important to recognise that forward-looking sonar doesn’t replace existing data sources such as depth sounder, charts and visual references. Instead it provides additional data to help make more informed decisions. However, short ranges of typically 30m-90m mean this is a tool for use in confined waters in which the navigator is focussed on the task and not distracted at a critical moment.

As with radar, a degree of skill and knowledge is also required to set the system up and to correctly interpret the picture.

On the racecourse

Short tacking along a shoreline to gain relief from a foul tide is a key element of racing in many tidal areas. However, there’s an ever-present risk of grounding , which has been implicated in the subsequent loss of keels of several yachts, sometimes with devastating consequences. Anything that can help reduce that risk is therefore clearly advantageous.

A B&G ForwardScan image from Newtown Creek on the Isle of Wight

B&G ForwardScan

Professional navigator Mike Broughton specified B&G’s ForwardScan sonar for a new race-spec Swan 78 he sails as navigator. The system, which has a 180kHz transducer, scans the seabed over a 15° arc up to 90m ahead of the vessel, though gently shelving mud may bring the viable range in shallow water down to as little as 25m.

As well as showing a graph of the depth ahead of the boat, the ForwardScan data can also be superimposed on a chart, with shading to indicate safe, warning and critical depths. ForwardScan uses a removable slimline transducer that extends 31mm below the hull.

Writing in Yachting World , Broughton said: “I have used ForwardScan to great effect short tacking against a strong tidal stream in the Solent, gaining the confidence to tack back to the shore before our competitors helped make significant gains. Confidence that you are clear for just another boat length as you approach the shore can be gold dust information and allow your boat to achieve a clear lane of clean wind.”

sonar-echo-sounders-bg-black-box-hub-600px-square

The company therefore also offers a wider range of products, including a StructureScan transducer, which are geared towards fishing markets and show more detail of the seabed.

Price guide

ForwardScan transducer: £731 ForwardScan fairing block: £41 B&G Sonar Hub or StructureScan 3D Module: £628 StructureScan through-hull transducer: £649

sonar-echo-sounders-EchoPilot-long-range-FLS-3D

EchoPilot’s long range FLS 3D system updates the seabed image every second

Long-established British brand Echopilot was one of the forerunners in this market and has been owned by the Danish Daniamant group since 2017. Echopilot’s range is optimised to show as much seabed detail as possible, rather than focussing primarily on displaying fish. It updates with very low latency and can be used at speeds of up to 20 knots.

The FLS 2D system has 30° beam width and maximum forward range of 200m, or ten times the depth in shallower water. The 7in screen uses different colours to represent different types of seabed structure, with hard materials such as rock showing as red and softer echoes from sand and mud showing as blue.

A more powerful FLS 3D model has twin retractable 200kHz transducers that give a 60° beam width. The range extends to 20 times the water depth, so around 200m in a 10m depth. Echopilot claims it can detect rocks at up to a distance of 500m.

Both models are also available in a black box format that will connect to any display with HDMI or VGA video input. In this case settings are controlled by a separate keypad that can be positioned next to the display.

FLS 2D with standard transducer and 7in display: £1,000 Echopilot FLS 3D with Dual Pro Transducers: £9,000

Garmin’s Panoptix LiveScope can differentiate between fish, seagrass and patches of sand

Garmin Panoptix

Many fishfinders show only the area below the boat or at the sides, but Garmin’s Panoptix products offer features that can be of use on cruising yachts. This range is available with through-hull transducers intended for fitting to yachts and has forward-looking functionality.

The FrontVü mode displays the seabed ahead of the boat at a range of up to 90m although, in common with other models, this reduces to eight to ten times the depth of water in very shallow water. The scanner has a 20° beam width and provides a clear picture at boat speeds of up to 8 knots.

Garmin’s top of the line Panoptix model, which has received rave reviews in the fishing community, is the LiveScope. This gives real-time scanning both forward and around the boat, with enough detail to see the difference between seagrass and patches of sand at a maximum range of 60m from the boat. On the downside, the LVS32 transducer is much larger and heavier.

PS51-TH transducer £1,360 Panoptix LiveScope with through-hull mounted transducer £1,870

While the ranges of recreational sonar units are clearly limited, they are a whole lot better than conventional depth sounders that have no ability to look ahead. Larger and more powerful transducers can provide more range at a frequency that allows a great deal of detail to be shown, but these may not be convenient to mount on a yacht and costs are significantly higher.

Race teams are interested in Far Sounder Argos 350 development

Far Sounder

Rhode Island-based Far Sounder produces a range of forward-looking sonar for large vessels with ranges of up to 1,000m at operational speeds of up to 25 knots. The company’s latest model has a smaller transducer with a 350m detection range that’s suitable for craft of 18-40m length.

The sonar map can be overlaid on CMAP professional S56/63 series charts in a similar fashion to the way we’re accustomed to overlaying radar on a chart. The downside, however, is that the transducer is still large for a sailing yacht – it measures 160mm x 200mm (6.4in x 8in) and needs to be at least 1m below the surface.

Could this system be used by racing yachts such as IMOCA 60s to give advanced warning of a potential collision with whales or shipping containers ? CEO Cheryl Zimmerman says the standard product could certainly do this for targets that are a couple of metres below the water.

She told me Far Sounder has been approached by race teams to “discuss some of the issues they are experiencing” and is “very excited” about the prospect of developing custom products with alarms to alert solo sailors.

Argos 350: US$55,000

Sonar performance

With sonar there’s always a conflict between range and detail. A low-frequency sonar of around 80kHz will be able to reach greater depths, but without a great deal of detail. Conversely, a higher frequency unit, operating at around 200kHz, will reveal more detail, but at the expense of range. Larger and more powerful transducers can provide more range at a higher frequency, but these may not be easy to mount on a yacht and become expensive.

Accuracy can be affected by factors including location of the transducer and water conditions. The strongest echoes are from hard seabeds such as rock and coral, whereas gently shelving sand or mud will only be seen at closer ranges and even then may not be as distinct.

Black box hubs can generate data for use on compatible chartplotter screens

Compatibility

We’ve come to expect much of the basic functionality of instrument systems and sensors to be compatible across displays offered by different manufacturers. However, this is by no means automatically the case for sonar, where there can even be gaps in compatibility even within a single manufacturer’s product range. In addition, many MFDs lack the software needed to process sonar data, so an intermediate sonar hub may be needed.

Before buying sonar equipment it’s important to understand exactly what the chosen technology will do and the equipment it will interface with. The technology is certainly not for everyone and, with a few notable exceptions such as short tacking along a shoreline, units for the recreational market are next to useless at typical passagemaking speeds due to the short range.

However, there are plenty of use cases in close-quarters slow-speed scenarios, including exploring poorly charted anchorages. This is just as relevant for cruising Greenland or Patagonia as for finding the deepest water over the bars of rivers such as the Rio Dulce in Guatemala or Senegal’s Sine Saloum. In these situations sonar could prove a powerful additional tool, particularly if time is spent on learning how to get the best from the system.

First published in the March 2020 edition of Yachting World.

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DepthTrax 2B | Boat Mount Depth Finder

SPECIFICATIONS

DIMENSIONS:

2" Diameter x 1.75" Depth (51 x 45 mm)

SCREEN SIZE:

Height: 1.65" Width: .87" (42 x 22 mm)

OPERATING TEMPERATURE:

0~160°F (-18~71 °c)

DEPTH RANGE:

2.5 ft (.7 m) ~ 600 ft (180 m)

WATERPROOF RATING:

IPX5 (front face only)

TRANSDUCER CONNECTOR:

2-Pin, Water Resistant

TRANSDUCER CABLE LENGTH:

30 ft (9 m)

TRANSDUCER FREQUENCY:

TRANSDUCER BEAM ANGLE:

POWER REQUIREMENT:

CURRENT DRAW:

INSTRUCTIONS

HawkEye® Installation and Operation Manuals

TRANSDUCER CONFIGURATIONS

PRODUCT VIDEOS

HawkEye® TechTutorial™ | DepthTrax® Boat Mount Depth Finders | Installation & Operation

HawkEye® TechTutorial™ | Boat Mount Depth Finders | Installation & Operation (Full Video)

HawkEye® TechTutorial™ | Installing a Boat Mount Depth Finder Display

HawkEye® TechTutorial™ | Transom Mounting a Transducer on a Boat

HawkEye® TechTutorial™ | Gluing a Transducer Inside the Hull of a Boat

HawkEye® TechTutorial™ | Installing a Thru-Hull Transducer

HawkEye® Product SnapShot™ | DepthTrax® Boat Mount Depth Finders

WHAT'S INCLUDED

Quick Start Guide

DepthTrax® 2B Display Assembly:

Storage Cover
White & Black Face Plates & Bezels
Display In-Dash Mounting Bracket
Thick Dash Extension
Power Harness with Waterproof Fused Holder
2-Pin Transducer Connector

Transducer Assembly:

Integrated Cable and 2-Pin Plug-&-Play Connector
Transducer Mounting Hardware

PLEASE NOTE: If gluing in-hull, we recommend purchasing our "Slow Cure Epoxy Kit for In-Hull Transducer Mounting (2-Pack)"

discover new depths

Unleash the power of precision with HawkEye DepthTrax® 2B, a boat mount depth finder combining cutting-edge sonar technology with seamless integration. Navigate with confidence and secure safe passage in unfamiliar waters. Elevate your boating experiences - journey fearlessly with HawkEye® DepthTrax® 2B.

Depth Range

The advanced sonar offers unbeatable depth readings down to 600 feet and is capable of generating accurate readings on plane up to 60 MPH.

INTELLIGENT SONAR

Proprietary algorithmic programming automatically pinpoints and intensifies bottom echoes, thereby greatly enhancing the accuracy of depth measurements.

range & sensitivity

There's no need for navigating through complex menus to adjust performance; the DepthTrax 2B efficiently manages all filters for you, accurately adjusting the right settings to precisely represent the water depth.

3-Stage Advanced

Warning system.

Activates both audible and visual alerts when shallow or deep water conditions reach user set parameters.

The dual mount transducer allows for transom mounting or adhesive attachment within most boat hulls.

4 Color Combinations

Personalize to suit your preferences. Included in the package are both white and black face plates and bezels, enabling you to generate four unique color combinations via mix-and-match. In addition, we offer an upgrade to a chrome bezel, designed to perfectly align with factory OEM dashboards.

Designed and Supported

HawkEye® products are produced domestically and abroad, incorporating technology that embodies the spirit of American innovation and creativity.

2 YEAR WARRANTY

You break it... we fix it....

For 2 years from the date of your original purchase we will warranty your depth sounder against any and all damage. Better yet, we promise to make it as painless as possible.

Customer Reviews

Haven’t got everything installed yet, just ordered a mounting bracket Looks perfect for the job I need. Thanks

Installed worked perfect! plug and play.

After initial problems with the product,during which Norcross customer support (specifically Jacob) were superbly patient (I probably caused the "fault") and constant, determined help, supplying a replacement display unit even before I returned the old one. There is no doubt in my mind that Norcross support is one of the very best supporters in business; maybe THE best.

Works well, direct responsive readout. Peace of mind navigating lake Champlain.

Why did I wait so long to replace my depth finder? This thing is great. Easy to install, easy to setup, and works amazing.

I'm already planning on buying one for my next boat.

My only suggestion would be to add a mute button to the alarm. It is loud, which is great when you need it, but is rather annoying when you launching, retrieving, or beaching the boat somewhere.

USE WITH ANY OF THESE ACCESSORIES

Boat Mount Depth Finder Surface Mount Bracket

Boat mount depth finder chrome trim ring, transducer exchange, slow cure epoxy kit for in-hull transducer mounting (2-pack), depthtrax® transom mount bracket, depthtrax 2b (display only), transducer extension cable (w/o temp), airmar® xdr-amr-p23-9150 non temp transom mount transducer, boat mount depth finder storage cover, airmar® glue-in transducer, depthtrax non temp 2" plastic thru hull transducer, transducer extension cable (w/temp), depthtrax 2bx (display only), boat mount depth finder refurbish kit, depthtrax® 2" plastic thru hull transducer with temperature, airmar® xdr-amr-p23t-9150 transom mount transducer with temperature, yamaha boat mount depth finder face plate kit, airmar® p23 transom mount bracket kit, boat mount depth finder gold trim ring, replacement nylon nut and washer for airmar p19.

How to Choose the Right Yacht Sonar and Depth Sounder

by yachtman
September 14, 2023 August 26, 2023

The world of yachts is a place with many opportunities for exploration. It’s essential to have the right tools before setting out. One such item is a yacht sonar and depth sounder .

When picking one, think about the kind of yachting you plan. Whether it’s leisure or fishing, you need a sonar that meets your requirements. Another point to think about is the size of your boat. Bigger yachts need more powerful sonar systems, while smaller boats may need compact but accurate systems.

You must also consider the region you’ll sail in. Water temperature and clarity, and hazards can all affect your choice. Some places may require specialized gear.

Let’s look at Captain James’ story . He was sailing across hazardous waters, and his outdated sonar couldn’t detect submerged dangers. Fortunately, he upgraded his equipment and avoided disaster.

Understanding Yacht Sonar and Depth Sounder

To understand yacht sonar and depth sounder effectively in choosing the right one, explore the sub-sections: What is yacht sonar, and what is a depth sounder?

What is Yacht Sonar?

Yacht sonar, also known as depth sounder , is a key tool for sailors. It helps them confidently navigate the depths of the ocean, by sending sound waves and measuring their return time. Yacht sonar provides information about the underwater environment’s depth and structure.

It can detect obstacles such as rocks, debris, and reefs that could harm the boat. This ensures the safety of sailors and their vessels. Plus, yacht sonar can help locate suitable places for anchoring or fishing. It allows sailors to explore new areas and make informed decisions about navigation.

What makes yacht sonar unique is its ability to generate detailed images of the underwater world. Some models give a visual representation of what lies beneath, allowing sailors to identify fish schools or even shipwrecks. This adds an exciting element to sailing.

For example, Captain Sarah was sailing in unknown waters. She used her yacht sonar to guide her, and it alerted her to a hidden sandbar below the surface. Thanks to this early detection, she maneuvered her boat safely and avoided grounding. This highlights how vital yacht sonar is for preventing accidents and ensuring smooth sailing.

What is a Depth Sounder?

A depth sounder is a device to measure water depth when a boat or ship sails. It works by sending sound waves into the water. The waves will bounce back when they hit something like the sea floor or underwater structures. By measuring how long the waves take to return, we can figure out the depth. This info is important for navigation and avoiding danger.

Below is a table with more info about the components and features of a depth sounder:

Some modern depth sounders have extra features like GPS, chart plotting, and fish-finding. These extras give boaters more tools for navigating and finding fishing spots.

Pro Tip: Calibrate your depth sounder regularly. Temperature and transducer position can affect performance.

Factors to Consider When Choosing Yacht Sonar and Depth Sounder

To ensure your yacht is equipped with the optimal sonar and depth sounder, consider key factors. Explore depth range and frequency, transducer type, display and user interface, installation, and compatibility. Each of these sub-sections holds crucial information that will guide your decision-making process and ultimately lead to the right choice for your yacht.

Depth Range and Frequency

A factor to remember when getting a yacht sonar and depth sounder is the depth range and frequency it has. The depth range is the min/max depths it can measure, and frequency is its ability to detect underwater objects/details. To understand better, here is an example table of depth ranges and frequencies:

Each system has different depth ranges and frequencies, depending on your needs. If you are going deep-sea or sailing open waters, get one with a bigger depth range . But for coastal or shallow water navigation, a system with a limited depth range would be fine.

Also, higher frequencies have better detail resolution , but not as good at penetrating deep. Lower frequencies penetrate deeper, but sacrifice some detail. So, select one depending on your use – if you want details, get a higher frequency; if you need accurate depth measurements, get a lower frequency.

Transducer Type

The transducer type is essential for choosing the perfect yacht sonar and depth sounder. It affects the accuracy and effectiveness of measuring underwater depths. Let’s explore the table below:

Also, specialized transducers exist for certain activities like ice fishing or deep-sea exploration.

Transducer technology has improved greatly over time. At first, basic single-beam transducers were just for depth measurement. Now, however, enhanced transducers offer side scan imaging and chirp technology.

By understanding the transducer types, you can select the right yacht sonar and depth sounder system according to your needs.

Display and User Interface

Yacht owners must think carefully about the display and user interface of a sonar and depth sounder, as they are key to providing accurate information and easy navigation. Here are five factors to consider:

Size: A larger screen is better for visibility and readability.
Clarity: High-resolution screens with good contrast enhance visibility.
Controls: User interface needs to have well-placed controls.
Customization: Layout should be able to be tailored to individual preferences.
Compatibility: Display should be compatible with other onboard systems.

Plus, technology is always improving, so yacht owners have access to cutting-edge technology with systems like Furuno’s NavNet TZtouch3 series .

Installation and Compatibility

Installation and Compatibility are key in choosing a yacht sonar and depth sounder. Let’s look at what to keep in mind:

Physical Installation : Is there enough space? Will it interfere with other components? Will it look good?
Power Requirements : Does it meet the yacht’s power restrictions? Low consumption? Voltage compatible? Additional power necessary?
Integration : Is it compatible with other onboard systems? No data transfer issues?

Here’s a table summarizing:

Plus, tech advancements mean better compatibility between marine electronics. Manufacturers work hard to make sure their products are compatible across different platforms and systems – an advantage for yacht owners!

Researching Yacht Sonar and Depth Sounder Options

To research the right yacht sonar and depth sounder, dive into reading reviews and expert opinions. Comparison of features and specifications plays a crucial role. Seeking recommendations and advice from experts and experienced yacht owners is also necessary for making an informed decision.

Reading Reviews and Expert Opinions

Reviews and expert opinions are valuable resources when researching yacht sonar and depth sounders. They can provide essential insights for decision-making. Here are four points to consider:

Actual user reviews give an idea of how the sonar and depth sounders work in real life. These experiences can uncover any potential problems or limitations that promotional materials don’t show.
Expert opinions offer great knowledge from testing and evaluating products. Experts often have access to many models and can provide informed perspectives on the pros and cons. Their expertise is valuable.
Comparing multiple reviews and expert opinions can give a comprehensive understanding of the strengths and weaknesses of different yacht sonar and depth sounders. This helps identify trends or issues across sources.
Lastly, it’s important to take note of any patterns that emerge from reading reviews and expert opinions. If several sources praise or criticize the same product, it’s likely a strong indication of its quality or drawbacks.

Besides reviews and expert opinions, it is good to look into unique details such as technological features or innovations. These may be in technical specifications or explained by experts.

Reading reviews has changed the way people make purchasing decisions. Before, limited information was available. Now, with online reviews, individuals can make informed choices based on others’ experiences. This has greatly benefited those looking for the best yacht sonar and depth sounders.

Comparing Features and Specifications

When looking into yacht sonar and depth sounder options, there are a few key factors to consider. These include frequency range, power output, depth capability, and any additional features like GPS integration or fish-finding capabilities.

Take a look at the table below for a comparison of features and specifications of these options:

To note, some yacht sonar options may offer higher frequencies for better target resolution. Others prioritize lower frequencies for greater depth penetration. Some models even provide advanced signal processing algorithms for clearer images and accurate depth readings.

A friend once sailed across the Pacific Ocean with a yacht sonar system featuring GPS and fish-finding capabilities. They navigated the treacherous waters and caught some trophy fish. This story shows how important it is to compare features and specifications before buying a yacht sonar and depth sounder.

Seeking Recommendations and Advice

When you’re researching yacht sonar and depth sounder options, experts can provide great insights. We’ve made a table of the top picks:

These are just a few examples. There are lots more to consider based on your budget and what you need. Think about reliability, user-friendliness, and customer reviews too. Compare specs and find something that fits your needs and preferences.

Pro Tip: Don’t forget to talk to experienced yacht owners or professionals. They’ll know what works best in different waters. Their advice can be invaluable when deciding on your sonar and depth sounder setup.

Evaluating Budget and Considerations

To evaluate budget and considerations when choosing the right yacht sonar and depth sounder, start by setting a budget and assessing long-term value. Additionally, consider the potential upgrades or add-ons to maximize the performance and functionality of your equipment.

Setting a Budget

Creating a budget is a must for managing money well. Establishing one gives you control over spending and you can be smart about where your money goes. Here’s the main points to keep in mind when budgeting:

Figure out your income sources : Work out all the streams of money coming in, such as salaries, bonuses, investments, and more.
Analyze your expenses : Take a deep look into what you spend and split them between fixed payments (e.g. rent) and variable expenses (e.g. going out).
Set financial goals : Decide what you want to accomplish financially in the short-term and long-term. This’ll help guide your budget decisions.
Create categories : Put your expenses into groups like housing, transport, food, utilities, debt repayments, savings, and discretionary spending. This’ll help you to see where most of your money is going.
Allocate funds : Give each category a certain amount based on their importance. Make sure you cover the essentials and leave room for savings and other spending.
Monitor and adjust : Keep an eye on how you’re sticking to your budget and make changes when needed. Track any deviations or unexpected expenses.

On top of these points, remember that budgeting requires commitment and discipline. You may have to make sacrifices in some areas for a while to get to your financial goals.

Assessing Long-Term Value

Evaluating the worth of a project over time involves analyzing its potential effects and sustainability. Consider factors such as financial plans, market trends, and competitor analysis carefully. Construct a table to display the assessment of long-term value comprehensively. Include columns for financial performance, market growth potential, competitor analysis, and risk assessment . Analyzing these parts gives knowledge about the project’s future and prospects.

Think about special details related to the project or industry. As an example, if the project is about new technologies or inventive innovations, think about their long-term influence.

Having an accurate assessment of the long-term value helps businesses decide where to allocate resources and invest. This lets them seize opportunities with potential for growth while avoiding dangers from short-term decisions.

Take the time to understand the long-term value of your projects. Analyze all the relevant elements before making big business moves. Not doing so might lead to missed chances or unexpected failures in the future. Being proactive in assessing long-term value ensures you have an eye on long-term success.

Considering Potential Upgrades or Add-ons

When you review your budget, think of potential upgrades or add-ons for your project. This will help boost the quality and looks of your product or service. Here’s what to consider and explore:

Also, check for unique requirements specific to your industry or customers. This can include specialized hardware, software, or customizations.

Here’s an example of considering upgrades or add-ons. A small e-commerce business invested in a mobile app to complement their website. This upgrade allowed customers to browse products on their phones and made sales soar.

Keep in mind, evaluating upgrades or add-ons should meet your financial limits and long-term goals. By carefully weighing the pros and cons, you can make good decisions that ensure your project succeeds.

Making an Informed Decision

To make an informed decision when choosing the right yacht sonar and depth sounder, weigh the pros and cons and finalize your choice. Understand the advantages and disadvantages of each option to ensure you select the most suitable equipment for your needs.

Weighing Pros and Cons

Let’s take a look at a table to better understand the process of weighing pros and cons. It helps in organizing the information to make it easier to compare.

The table shows that each factor has its own set of advantages and disadvantages. For instance, cost can be affordable or expensive. Time can be quick or time-consuming. Quality can be high or low.

It’s essential to consider all these factors when weighing pros and cons. These details offer valuable insights that can shape our understanding of the situation. This allows us to make an informed decision.

Research from Stanford University reveals that when individuals weigh both the positives and negatives, they are more likely to make decisions that match their long-term goals.

Finalizing Your Choice

When it comes to your choice, weigh all options. Think of quality, cost-effectiveness, and long-term sustainability .

Look for features that set one option apart from others. Find key differentiators that match your needs and preferences. This will help you choose the perfect fit.

History shows the importance of wise decisions. Business decisions have shaped industries and personal choices have had far-reaching consequences. Learn from stories and get advice from experts. This can help you make informed decisions.

In summary – Finalizing Your Choice requires considering various factors and unique details. Understand the significance of past decisions for guidance. Embrace creativity and curiosity in this important process.

Choose the perfect sonar and depth sounder for your yacht! Start by evaluating your needs and researching available options. Ask experts to help you select the right one. Consider size, technology, user interface, and future compatibility.

Go with state-of-the-art sonar tech for accurate measurements. Enjoy features like advanced imaging and real-time data updates. Get an intuitive display system with clear readings and easy-to-use controls. Opt for something upgradable to keep up with tech advancements.

Take action now! Upgrade your yachting experience and explore waters with confidence. Discover underwater realms and use cutting-edge tech to bring your yacht to a new level. It’s time to ignite your passion for adventure.

Frequently Asked Questions

Q: What is a yacht sonar and depth sounder?

A: A yacht sonar and depth sounder is a device used to measure the depth of water beneath a yacht. It uses sound waves to determine the distance between the yacht and the seabed, and also helps in locating underwater objects and obstructions.

Q: Why is it important to choose the right yacht sonar and depth sounder?

A: Choosing the right yacht sonar and depth sounder is crucial for a variety of reasons. It ensures accurate depth measurements, provides reliable information about underwater conditions, and helps avoid potential hazards. A quality sonar system can greatly enhance the safety and performance of a yacht.

Q: What factors should I consider when selecting a yacht sonar and depth sounder?

A: When choosing a yacht sonar and depth sounder, it is important to consider factors such as the depth range it can measure, the frequency of the sonar, the display features, compatibility with other navigation equipment, power requirements, and the reputation of the manufacturer.

Q: What is the difference between single frequency and dual frequency sonars?

A: Single frequency sonars transmit and receive sound waves at a single frequency, providing a wide coverage but limited detail. Dual frequency sonars, on the other hand, transmit sound waves at two different frequencies, allowing for better target discrimination and more detailed imaging.

Q: Should I choose a fixed-mount or portable yacht sonar and depth sounder?

A: The choice between a fixed-mount and portable sonar depends on your specific needs. A fixed-mount sonar is permanently installed on the yacht and typically offers more advanced features. Portable sonars are compact and easy to transport, making them ideal for occasional or temporary use.

Q: How much does a quality yacht sonar and depth sounder typically cost?

A: The cost of a yacht sonar and depth sounder can vary depending on the brand, features, and performance. Prices typically range from a few hundred to several thousand dollars. It is important to find the right balance between your budget and the desired functionality.

Sail Confidently With the Best Depth Finders

Our content is meticulously curated through independent research, testing, reviews, and AI-driven recommendations, all designed to present you with the finest product choices. When you make a purchase through our links, it could result in us earning a commission.

Whether you are looking to reel in fish or just spend some relaxing time on the water, a depth finder is one gadget you should have in your boat. And if you are looking for the top depth finders in 2024, this guide is just for you.

Depth finders also called echo finders, are simply devices used to determine the depth of a water body just below the surface. They work by measuring the time taken for sound to be reflected or echoed back from the bottom – since the speed of sound in water is constant and known, the longer it takes for the echo to be reflected, the deeper it is to the bottom.

But not all depth finders are made equal – between the different brands, designs, and price points, the options can easily get overwhelming. And some depth finders are dedicated while others aren’t.

To save you the shopping hassle, we have compiled a list of depth finders that stand out from the rest.

Our Top Picks

Top Pick: LUCKY Wired Depth Finder Shop Now ➔
Runner Up: HawkEye DT1B Depth Finder Shop Now ➔
Honorable Mention: Humminbird HDR650 Depth Finder Shop Now ➔
Contender: RICANK Depth Finder Shop Now ➔
1 Are Depth Finders the Same as Fish Finders?
2 What Factors Should I Consider Before Buying a Depth Finder?
3 Intended purpose and water profile
4 Gauge design
5 What Are the Different Types of Transducers?
6 Thru-hull transducers
7 In-hull transducers
8 Transom transducers
9 Connectivity

Do depth finders make noise?

Can i use a fish finder as a depth finder, how much do depth finders cost, related content, detailing our favorite depth finder of 2024.

LUCKY Wired Depth Finder

This depth finder finds depth and some more – it is also a fish finder. It is a great buy for water sports enthusiasts and anglers who want a handy depth finder to use in shallow to medium-depth water.

It is very versatile
It is budget-friendly
It is portable and can be used in different ways
Its depth measurement is limited
It is handheld and may easily get misplaced

Key Features

The LUCKY depth finder comes as a wired depth finder with a digital handheld unit that connects via a 7.4 m cable to its 200 kHz 45° wide-angle transducer. It measures up to 100m depths, comes with a fish alarm, and displays profiles and locations of fish, plants, and debris. It is very portable and comes with extra accessories including a float, neck strap, and mounting bracket, and also costs $41.

HawkEye DT1B Depth Finder

This dedicated depth finder is great at the only thing it does – finding depth. It is easy to install, fits both slow and fast boats, and is exceptionally user-friendly.

It boasts superior depth measurement
It is intuitive and user-friendly
It is easy to install
It can only measure the depth
Its display is very basic

The HawkEye DT1B depth finder includes a digital gage that’s small enough to fit into most gage openings and comes with two interchangeable bezels to fit your boat’s accent. It features a multi-mount transducer engineered to give accurate depth readings to up to 600 feet below the surface and at up to 60 mph and includes a transom mount and in-hull mount among other installation accessories for mounting ease. The digital gage is user-friendly with a polarized backlit display to maximize visibility, features a 3-stage alarm system, and runs on algorithmic software for maximum accuracy. It goes for around $87.

Honorable Mention

Humminbird HDR650 Depth Finder

This depth finder is designed to blend right in with your boat’s dashboard or instrument panel. It is exceptionally versatile for different boat profiles, is easy to install, and won’t interfere with your boat’s performance.

It performs well even at high speed
It is user-friendly and intuitive
It is quite pricey
It only measures depth

The Humminbird HDR650 depth finder features an in-dash digital gage with intuitive controls, a waterproof seal, and three customizable bezels for different boat dashboard accents. The transom-mounted sonar transducer measures up to 600 feet below the surface and at up to 70 mph and also includes all its mounting accessories. The whole unit costs around $110.

RICANK Depth Finder

This depth finder is the ideal tool for the angler or water sports enthusiast on a budget. It packs a depth and fish finder into one and is exceptionally versatile in different environments.

It can be used in different environments
It is not the ideal high-end option
It has a limited depth range

The RICANK depth finder shares some features with the LUCKY depth finder including its digital gage that gives a fish and contour profile, 25-foot connection cable, handheld design, and intuitive controls. Its transducer can be used with the included float or fixed to the boat and gives accurate readings at up to 100 feet below the surface with its wide-angle 45° sonar beam. The gage also comes with great battery life, giving a 5-hour running time on its batteries, and other accessories are included for the most functionality.

Finding Your Next Depth Finder: A Buyer’s Guide

Knowing the depth below the water surface can help you navigate your boat safely and avoid obstacles as you move. Enter depth finders – the way they use sonar or sound to determine depth has not changed much. However, depth finders are slowly being replaced by multi-purpose units targeted toward different boating needs, and finding a dedicated depth finder can be a little hard.

Earlier on in this guide, we gave you an outline of the best depth finders on the market but you may still be in a fix as to which to choose. We’re still here to help. In the rest of this buying guide, we will take a look at some of the deciding factors we considered and which you should too so that you can zero in on the perfect depth finder for your boat. We will also take a look at some must-have qualities for depth finders before you make a purchase.

Are Depth Finders the Same as Fish Finders?

For newbies, the difference between depth finders and fish finders can get confusing. Many platforms even use them interchangeably, only fueling the misconception that they are the same. In reality, they are not. Well, not completely. Depth finders are devices used solely to determine the depth of the bottom from the surface. Fish finders, on the other hand, are designed with anglers in mind to find fish below the surface. Many fish finders may include a ‘depth finder’ feature but the reverse is not usually the case. As depth finders are dedicated, they use lower frequency sound waves and measure the depth to a far greater range than fish finders.

What Factors Should I Consider Before Buying a Depth Finder?

Intended purpose and water profile.

What exactly are your intentions on the water? Do you want a depth finder to use when sailing, kayaking, fishing, or when on your boat leisurely? Your intended purpose will determine the type of depth finder you get or whether you get one at all.

Where you’ll be using your boat will also determine the depth finder you buy. Sailing in the ocean will require a depth finder that can detect o much lower depths than another you’ll be using while on a lake.

Gauge design

The gauge or display unit of the depth finder must be very user-friendly and come with intuitive controls. Many times, dedicated depth finders will come with displays in black and white. Fish finders, on the other hand, emphasize being able to see fish and the bottom profile, and will often with colored digital displays.

The gauge on the depth finder should also be easily integrated into your boat panel. It should fit into standard boat dashboards or cup holders and should blend with its accent. To ensure this, many depth finders include extra gauge bezels in common boat dashboard colors that are easily interchanged.

What Are the Different Types of Transducers?

The transducer on the depth finder is where all the action happens. Depth finder transducers can be categorized based on how they are mounted and their frequency ranges. However, as depth finders typically work in a tight frequency range (between 15-50 kHz) we will only consider transducers based on how they are mounted.

Thru-hull transducers

Thru-hull transducers are screwed into a hole drilled in the hull of your boat. They offer the most secure fit and minimum drag through the water, but their performance may be affected when the boat moves at high speed.

In-hull transducers

In-hull transducers send the sound signal through the hull of the boat and are mounted inside the boat. They offer the most minimal effects on the boat’s performance but are only suited to thin boats made from materials like fiberglass that won’t absorb the sound.

Transom transducers

Transom transducers are mounted on the stern of the boat. They are the easiest to install and are suited to smaller boats.

Connectivity

How the gauge connects to the transducer is another important factor to consider. Most depth finders will come with a wired connection that uses a plug and port. However, some high-end depth finders may feature wireless connectivity that may even be integrated with your mobile device or GPS for added functionality.

Article Contributors

Sail magazine review team.

SAIL Magazine Review Team reports on best-selling products in sailing and boating. The SAIL Magazine editorial staff is not involved in the creation of this content. SAIL Magazine is reader-supported: When you buy through links on our site, we may earn an affiliate commission. The SAIL Review Team is composed of authors, editors, and sailors. Artificial Intelligence (large language models) may have been used in the research and creation of the content.

To ensure questions about product testing or a specific article are addressed, please contact [email protected]

The 10 Best Depth Finders

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TripSavvy / Chloe Jeong

Knowing even the most basic information about what's under the surface can save you from running aground. But today's depth finders can do much more than simply give you a sense of where the bottom lies. Most devices focus on helping anglers understand the ocean floor's depth and topography. But they also paint a high-resolution picture of where the fish are swimming or hiding, the various water temps in the water column to help pinpoint your casting, and have loads of other technologies to help with navigation and custom readings and alarms.

From handheld devices to in-depth high-res displays that will compliment the most kitted-out of consoles, these are the best depth finders.

What to Look For

Why Trust TripSavvy

Best overall, lowrance hds-7 live.

Comprehensive package for most uses

Connects with smart phone (or not)

The screen size dictates the level of tech in each device, which may prove tricky to marry your needs if you have a crowded console

To get a clear picture of everything that’s happening below the surface of the water, go with the HDS-7 Live with Active Imaging 3-in-1 from Lowrance. The SolarMAX HD touch screen makes it easy to access all types of data, and with four different screen size options, you can find the perfect device to match your console. It comes with a pre-loaded C-Map Contour+ mapping tech and coastal charts that can capture image detail down to a half foot, which is supplemented with Active Imaging 3-in-1 with chirp sonar, side- and down-scan imaging, FishReveal, and a Ghost Trolling Motor.

High-res ActiveTarget Live Sonar shows where the fish are moving, swimming in and around cover, and responding to your lure to let you know if things are working, or if you need to change strategies. It even syncs with your smartphone via the HDS Live tech, displaying a pop-up notice when you receive calls or texts (a function you can easily disable by turning off your phone).

Type: Chirp sonar with side- and down-scan imaging | Screen Size: 7, 9, 12, and 16 inches | Dimensions: 9.21 x 5.73 inches in the smallest screen size, 16.98 x 10.20 inches in the largest

Best Budget

Hawkeye depthtrax 1h handheld depth finder.

Inexpensive

Includes a wrist lanyard

It might be too simple for anglers looking for reliable fish beta

Simplicity reigns supreme with the lightweight, hand-held HawkEye DepthTrax 1H Handheld Depth Finder. A clear digital display provides depth measurements from 2.5 feet down to 300 feet, as well as temperature readings that are accurate to within a tenth of a degree. Measurements are provided by 300-watt DepthTrax Sonar powered by a nine-volt battery. And the device is encased in a robust ABS housing, along with dual O-rings that make it fully waterproof down to 200 feet. Bonus: A two-year warranty reinforces how reliable the device will be. It can read the water depth through the hull of most boats, but can’t cut through air pockets, wood, or thick aluminum.

Type: Sonar transducer| Screen Size: 1.65 x 0.87 inches | Dimensions: 2 x 2 x 8 inches

Best Splurge

Humminbird helix 15 chirp mega si+ gps g4n.

Everything you’ll ever need for confident navigation and fish-finding

Comes with extensive library of maps

No inline fuse included

Boasting a large 15.4-inch display the Humminbird Helix 15 Chirp Mega SI+ GPS G4N justifies its spendy price tag. It comes with MEGA side and down imaging tech that maps out to 200 feet, and dual-spectrum chirp sonar, which pairs with an internal GPS and an extensive library of Hummingbird Basemaps (more than 100,00 lakes and most of the continental US). Push-button controls line the right side of the device, making it easy to access preloaded views. You can also toggle through either wide mode sonar to maximize coverage and capture fish arches and fish-holding structures and the narrow mode to drill in on smaller details.

Customization via AutoChart Live lets you create real-time maps of your fishing and navigation spots, including details like depth contours, bottom hardness, and vegetation, all with an eight-hour-long recording time. And if you want to go really big on the data, it can create an ethernet network to sync up with other fish finders and provides Bluetooth connectivity to Hummingbird products like the Talon and Raptor shallow-water anchors and downriggers.

Type: Chirp sonar with down and side imaging | Screen Size: 15.4 inches | Dimensions: 17.63 x 10.62 inches.

Best Controls

Raymarine axiom pro 9 rvx.

Robust display options and easy navigation

Fairly easy installation

No custom mapping

Raymarine’s Axiom Pro 9 RVX packs a lot of features into a small package, employing an easy-to-read multifunction display on its 9-inch screen. Touch controls are supplemented by a small sequence of buttons and a rotary knob on the right side, making it easy to toggle through the different options. And options abound. An offshore-rated 1KW chirp sonar captures clear images of the terrain, features, and fish lurking under the water, and includes low, medium, and high settings to target deep or shallow-water fish.

Everything is displayed on a super-bright high-def IPS screen, powered by a super-fast quad-core processor and the smart LightHouse operating system. You also get FLIR thermal night vision tech, multiple Axiom displays, Evolution autopilot, and RealVision 3D with GPS to construct the most accurate model of the underwater terrain. As with most high-end depth finders, the Axiom Pro 9 can network with Raynet Ethernet, and built-in WiFi lets you control the device from your phone or tablet.

Type: Chirp sonar with RealVision 3D mapping | Screen Size: 9 inches | Dimensions: 11.9 x 6.85 inches

Best GPS Depth Finder

Garmin striker vivid 9sv.

Accurate GPS

Relatively inexpensive

Stores up to 2 million acres of maps

Detail-obsessed anglers may want a larger screen

It’s no surprise that navigation pioneers Garmin make some of the best GPS-enabled depth finders, and the STRIKER Vivid 9sv hits the sweet spot of ample features and a relatively modest price tag. Powered by a GT52HW-TM transducer, you can choose from chirp traditional, ClearVu, and SideVu sonars, which pick up contours for objects and terrain as small as one foot, and also choose from seven vivid color display options to illustrate the fish and underwater structures in a way that resonates with your preferred aesthetic and reading preferences.

You can also customize your maps with waypoint marking to track hot spots and quickdraw contour tech that lets you store up to 2 million acres of maps. All of this partners with a high-sensitivity GPS, letting you plan and create routes, as well as view your boat’s speed. Naturally, it’s WiFi-enabled and can pair with Garmin’s ActiveCaptain app to transfer waypoints, receive notifications and software updates, and drop into the Garmin Quickdraw Community. The small device comes on a tilt/swivel mount, along with transom and trolling motor mounting hardware and cable.

Type: Chirp traditional as well as side and down view | Screen Size: 9 inches | Dimensions: 11.1 x 6.5 inches

Best with Temperature

Faria beede depth sounder.

Simple and easy to use

Only applicable for transom mounting

If you’re just looking for a device that offers a quick-glimpse read of salient data like depth and temperature, go with the Faria Beede Depth Sounder. Operating on a 235 kHz frequency, it reaches down to 199 feet and comes with deep and shallow water alarms. Choose from US standard or metric units, which are very readable thanks to the back-lit digital display, and a programmable keel off-set helps dial the device to match your boat. Outside air and water temp readings range from 32 to 200 degrees.

Type: Standard transducer | Dimensions: 2 inches

Best with Speed

Raymarine i50 tridata digital instrument display.

Front-mounted design makes it easy to install

Easy to use push-button controls

If you want a depth finder to help with your fishing, this isn’t it

Ideal for smaller powerboats, rigid inflatables, and yachts, the Raymarine i50 Digital Instrument Display provides quick insight into the depth and boat speed, with a red-back lighting option for enhanced nighttime visibility. All stats are displayed across three lines (depth, speed, and log info), and the device can also track sea temperature and SOG–a measurement that captures the boat’s speed through the water plus other factors like current and wind. Push-button controls simplify operation, letting you toggle through three data display options and set shallow-depth alarms.

Type: Traditional transducer | Dimensions: 11.5 x 5.5 x 4 inches

Best Handheld

Hawkeye fishtrax 1c fish finder.

An integrated mounting system lets you marry the device with any fishing platform

Easy to toggle through displays

No recording or waypoint functionality

HawkEye has packed a lot of fish-finding features into the Fishtrax 1c Fish Finder. Active solar locates fish depth down to 240 feet and measured water temp and bottom contour to quickly help you orient where to cast. A simple network of buttons makes it easy to toggle through the various displays–bottom contour, fish icons, and data modes, with everything displayed on the easy-to-read HD color display.

An automatic mode makes it easy to start using, or you can program in precise readings via manual mode and program alarms that trigger when fish are present or the desired depth has been measured. The VariableZone Temperature Setting tracks temps throughout the water column to pinpoint specific fish species. It also runs on AAA batteries, it comes in a durable waterproof housing, and the ice mode flasher makes it a four-season, ice-fishing-ready depth finder. Pro-tip: To save on cost and waste, check out the rechargeable lithium batteries from Pale Blue Earth .

Type: Dual-frequency sonar | Screen Size: 2 by 1.6 inches | Dimensions: 6 by 3 inches.

Best for Ice Fishing

Humminbird ice helix 5 chirp g3.

Easy to see whether on the ice or in a shed

Glove-friendly controls

The 5-inch display is pretty small, though you can upgrade to as large as 9 inches

Ice fishing is challenging enough without having to wrestle with your depth finder. So if you like to ply the frozen lakes of the world, arm yourself with the Ice Helix 5 Chirp G3 from Humminbird. It employs dual-spectrum chirp sonar to render a high-res image of individual fish, bait, and structure in both flasher and traditional 2D views, separating targets down to three-quarters of an inch.

Six settings keep competing signals from cluttering the screen, and an adjustable sonar zoom feature helps you focus in on fish, whether they’re hiding at the bottom or elsewhere in the water column (two-times zoom in flasher mode, 16-times in 2D). The whole package comes in a soft-sided shuttle/carrying case, with a built-in cable and transducer management system to keep things organized. You can even use the device to charge any glow-painted spoons or jigs.

Type: Dual-spectrum chip sonar | Screen Size: 5 inches

Best for Kayaks

Garmin striker 4.

Compatible with higher-performance Garmin transducers

No smart device or Garmin map integration

Small enough to stash under your PDF and easy to mount on the helm of your kayak, the Garmin STRIKER 4 comes with a dual-beam transducer to more accurately map the contours and fish locations lying under the waves. Smooth Scaling graphics on the 3.5-inch display provides uninterrupted imagery while cycling through depth-range scales, and a history feature lets you scroll back through images to mark waypoints you might’ve missed. A built-in flasher and speed displays add versatility, and you can also mark hot points with the GPS-enabled device, and share those with other STRIKER and echoMap products.

Type: Dual-beam sonar | Screen Size: 3.5 inches | Dimensions: 3.6 x 5.9 inches

What to Look for in a Depth Finder

Standard vs. chirp sonar.

Depth finders that use standard sonar to detect what’s below utilize a single beam of sound at a set frequency that bounces off something below to capture data like fish placements or structures on the seafloor like reefs or rocks. This provides some basic information relating to the depth at which that object sits, but it doesn’t offer much clarity as it relates to what that object might be. Chirp sonar ups the ante by sending quick bursts of sonar waves in a variety of frequencies to more accurately read what’s below, and also offering more insight into what’s being detected because the chirp sonar can also capture data on what’s moving, increasing your chances of finding fish.

Down Imaging vs. Side Imaging

Rather than merely detecting the depth of an object with either standard or chirp sonar, down imaging depth finders use a thin array of high-frequency sound waves and layers the data into a 3D illustration of what’s below your boat, helping you quickly ID the objects so you can distinguish between rocks, fish, or other objects. As its name implies, down imaging focuses on what’s directly below your boat. Side imaging depth finders, meanwhile, use two sonar beams (typically angled slightly away from your boat) to create images on both sides of your watercraft, capturing contour changes, fish, and other structures.

The transducer is the technology that transforms electrical pulses into the sound waves that power the sonar and then transfer the data into the device so it can generate the data you read on-screen. Given this is the key component of depth finders, make sure the target product has a robust transducer (the stronger the transducer, the deeper the readings) and an overall durable construction with strong materials that will protect the “heart” of the product over prolonged use. Some devices (like handheld GPS devices) can also work with other, more powerful transducers if you want to upgrade from what comes out of the box.

As its name implies, depth or fish finders use sonar to illustrate the distance between you (at the surface of the water) and the objects that are either directly below you, or at a set radius around you. This will help you line up your target casting depth and also respond to other underwater features like reefs, rocks, and other objects. Boaters also use standard depth finders to make sure they don’t run aground in shallow water, but the bulk of the applications for angling-specific depth finders is to make it easier to find—and land—fish.

Simply put, depth finders tell you where the fish are in the water, whether moving at a set distance or holed up in an underwater feature like a crevice or crater. The data illustrates the actual depth and location of the fish to improve your chances of casting correctly, or to tease out fish from shelter. The best ones also tell you what’s not a fish, read water temps throughout the column, show where fish are hiding, and illustrate a 3D graphic of the entire topography under the waves.

Each depth finder comes with a screen that displays the data captured by the transducer. Inexpensive, simple models may just display the depth detected in a digital display but not offer insight into what’s detected. If you’re just looking to know the depth to the bottom, these simple devices will suffice. But if you’re looking to use the depth finder as a way to detect fish, we recommend getting a device with a high-resolution screen that displays more data than simply how deep an object might be from the water’s surface.

Screen sizes naturally vary, but most should provide enough real estate to accurately display the data—in handheld devices, you’ll typically scroll through depth ranges. But if you’re going with a mounted depth finder, you can go with larger screens than you might find on portable devices.

Nathan Borchelt has been rating, testing, and reviewing outdoor and travel products for decades. In examining each potential entry for inclusion, each product was evaluated based on its key features, ease of use, durability, and key advantages for various types of applications. This research was then supplemented by both professional and verified customer reviews.

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Need in-hull depth finder — recommendations?

Thread starter CHI->CO
Start date Aug 29, 2019
Forums for All Owners
Ask All Sailors

CHI->CO said: My budget is $100-300. Click to expand

Charlie Jones s/v Tehani

Agree completely with John. Even as to the plastic bag idea. I prefer Lorance and have then on both of my boats, with transducers glued to hull

jssailem said: Aileen... I am confused... Is that per weekend or the depth sound equipment? Lots of ways to go. If you do not want to take your boat out of the water to drill a hole through the bottom to install a transducer, you can choose a fish finder unit. Lorance, Hummingbird, Garmin etc. all make reasonable equipment. You can try and locate the transducer in the water on the transom, but it can work nearly as well located inside the boat lying on the hull. Put the transducer in a plastic bag. Fill the bag with water and then lay the bag on the hull. You can move it to various locations. Turn on the depth finder and see how it works. As a general idea if you can locate the transducer just inferno of the keel (ahead of the base of the mast) you'll get a great picture of the bottom and what is approaching your boat. Note the sound is being emitted as a small cone of sound. Then the unit is listening for the bounce back from something solid in the water. (fish, rock, sea floor etc.). Move the bag about until you get a good clear picture from the bottom. Then that is where you want to locate the transducer. You can attach it to the hull with Bees Wax, or caulk, There are a variety of options. As far as budget, the plain depth sounder is not expensive.. If you what to add a chart plotter to the fish finder then the budget goes up. Welcome to the forum. Happy sailing. Click to expand

good advice above, I prefer plumbers putty, works well, less messy than toilet wax and not permanent...I too have lowrance, depth/chart plotter, was ~ $300

Who needs sand for ballast when there is so much wine and beer to be had. Cheers.

Arimar makes most of the transducers and the one that you want for in-hull installation is P79. However, the way how the transducer is connected to you display unit depends on the vendor, so not all of them are easily changeable. Many people installed a "normal" through-hull transducers inside their hulls, as well (as described in previous posts) with good results. However, the P79 is specifically designed for that purpose.

+1 for Airmar. Just mind the connection to the display. They do make converters for the connections.

CHI->CO said: Haha, I’ve more than exceeded $300 in the first 3 days Click to expand

jssailem said: ... locate the transducer just inferno of the keel ... Click to expand

In the same boat, what is the purpose of the plastic bag?

Davidasailor26

Mattcia123 said: In the same boat, what is the purpose of the plastic bag? Click to expand

garymalmgren

HOOK² 4x Fishfinder with Bullet Skimmer Transducer | West Marine

Boatspeed - Apps on Google Play

I'm pretty much in the same boat as you, looking at getting and installing a depth finder, but I decided to go with the sonar phone fish finder, I figure I'm using either my phone or iPad for maps so might as well use the sonar phone to complement my navionics app, it's around 200$ easy to use and install

rpludwig said: good advice above, I prefer plumbers putty, works well, less messy than toilet wax and not permanent...I too have lowrance, depth/chart plotter, was ~ $300 Click to expand

I have a spelling checker, It came with my PC. It plane lee marks four my revue Miss steaks aye can knot sea. Click to expand

Eye ran this poem threw it, Your sure reel glad two no. Its vary polished in it's weigh. My checker tolled me sew. Click to expand

A checker is a bless sing, It freeze yew lodes of thyme. It helps me right awl stiles two reed, And aides me when eye rime. Click to expand

Each frays come posed up on my screen Eye trussed too bee a joule. The checker pours o'er every word To cheque sum spelling rule. Click to expand

Bee fore a veiling checker's Hour spelling mite decline, And if we're lacks oar have a laps, We wood bee maid too wine. Click to expand

Butt now bee cause my spelling Is checked with such grate flare, Their are know fault's with in my cite, Of nun eye am a wear. Click to expand

Now spelling does knot phase me, It does knot bring a tier. My pay purrs awl due glad den With wrapped word's fare as hear. Click to expand

To rite with care is quite a feet Of witch won should bee proud, And wee mussed dew the best wee can, Sew flaw's are knot aloud. Click to expand

Sow ewe can sea why aye dew prays Such soft wear four pea seas, And why eye brake in two averse Buy righting want too pleas. Click to expand

Hydro Therapy

I used plumbers putty and its held fine for 3 seasons. I even get correct water temp. As far as speed my unit has depth and chartplotter. I rely on the gps for speed. My unit is a Garmin. I find them to be user friendly.

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boat echo sounder D10D

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boat depth sounder D110

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Depth Sounders: What They Are and How to Use Them

A depth sounder is an electronic device that uses sound waves to measure the depth of the water and gives you an idea of what kind of underwater landscape is below you.

Table of Contents

What is a depth sounder?

A depth sounder is an instrument used to measure the depth of water, usually found on boats and other water vessels.

It works by emitting sound waves from a transducer and measuring how long it takes for the waves to reach the bottom and reflect back.

This time can then be used to calculate the depth of the water below.

Depth sounders are essential for navigation, allowing captains to discover and avoid hidden shoals or muddy grounds and contours that could lead to accidents.

How does a depth sounder work?

Depth sounders use a process known as sonar (SOund Navigation and Ranging) to measure the depth of water.

A transducer, which is an electronic device that converts electrical energy into acoustic energy, is mounted at the bottom of the boat and emits sound pulses into the water.

These pulses are sent in all directions and will eventually bounce off of the seabed or any other object that lies beneath the surface.

The returning echoes are picked up by the same transducer and then sent to the display unit on board the boat, which then produces a reading of the depth.

The time between when the sound wave was emitted and when the echo was received is measured and used to calculate the depth. This information is then presented in either feet or meters on the display screen.

In addition to depth, depth sounders can also be used to detect other objects underwater.

Some sounders come with a fish finder feature, allowing you to see if there are any fish in your area.

It is important to note that this technology does not provide precise information about where exactly a fish is located, but rather it gives you an indication of whether fish are present.

How accurate are depth sounders?

The accuracy of depth sounders can vary depending on the model. Generally, most depth sounders are accurate within one or two feet of the actual depth.

The accuracy can be affected by a number of factors, including water temperature, salinity, the composition of the sea floor, and the presence of debris in the water.

Many modern depth sounders come with an automatic adjustment feature to account for changing conditions. However, even with these features, some variation may still occur when taking readings.

What frequency is a depth sounder?

Depth sounders typically use a frequency of 200kHz or higher. This frequency allows for a deeper depth range than traditional sonar devices that operate at lower frequencies.

The higher frequency also allows for more accurate readings, as the higher frequency waves can penetrate deeper into the water .

Additionally, depth sounders can measure depths up to 3,000 feet, which is much greater than what traditional sonar systems can measure.

The main benefit of a depth sounder is its accuracy. As the higher frequency waves penetrate deeper into the water, they can detect a more precise reading of the bottom of the body of water.

This allows fishermen and sailors to accurately calculate their position relative to the bottom of the sea or lake.

Depth sounders also provide detailed information about the structure of the bottom of the body of water, which can be helpful when navigating or fishing.

How do you read a depth sounder?

Reading a depth sounder is relatively easy once you know the basics. The most basic depth sounders feature a small, LCD display with a series of numbers and symbols.

Generally, the deeper the depth, the more numbers that appear on the screen. The most common depths will have three digits: feet, tenths of feet, and hundredths of feet.

For example, the number 15.6 means fifteen feet and six-tenths of a foot.

Depth sounders can also display a variety of other readings, such as water temperature, fish location, and bottom contours.

To read these readings, consult the user manual for your specific model. The manual will explain the meaning of all symbols and numerical readings.

Once you understand how to read a depth sounder, you should be able to use it effectively.

Remember that depth sounders are most accurate when used in deep water and/or when used in a straight line. Move slowly and steadily while reading a depth sounder to get the most accurate readings possible.

What is the easiest sounder to use?

For those looking for a sounder that is simple and straightforward, a basic digital depth sounder is often the most accessible and easiest to use.

A digital depth sounder typically displays the depth in feet or fathoms on an LCD display. This type of sounder can be either hand-held or mounted in the boat.

The readings may not always be as accurate as a more advanced model, but they provide quick and easy readings and are usually easier to install than more advanced models.

Additionally, this type of depth sounder is often less expensive than more complex models. If you’re just starting out and want something quick and easy to use, a digital depth sounder may be the best choice.

Depth sounder vs. sonar

Depth sounders and sonar are two similar, yet distinct technologies used for measuring the depths of bodies of water. Both use sound waves to measure depths, but there are some key differences between the two.

Depth sounders emit sound waves that travel down into the water and bounce back up, providing an accurate measurement of the depth.

Sonar, on the other hand, emits high-frequency sound waves which penetrate the water and spread out in all directions. These sound waves then bounce off objects and return to the sonar device, creating a detailed picture of the area below.

The main difference between depth sounders and sonar is the type of data they provide.

Depth sounders provide only a basic measurement of the depth while sonar creates a more detailed map with additional information such as objects at various depths and bottom contours.

This makes sonar a better option for navigation purposes than a depth sounder.

In terms of accuracy, both depth sounders and sonar are generally reliable for measuring the depths of bodies of water. However, sonar can be more accurate than depth sounders in certain conditions due to its ability to generate a detailed map.

When it comes to choosing between depth sounders and sonar, it is important to consider your needs and the environment you are operating in.

If you require only basic measurements of the depth or need to operate in shallow waters, then a depth sounder may be the better choice.

However, if you require a detailed map of the area or are operating in deep waters, then sonar is the more suitable option.

Depth sounder vs. fish finder

Both of these devices are great tools for helping you catch more fish, but they both work differently and have different advantages and disadvantages.

A depth sounder is a device that uses sound waves to measure the depth of water in an area.

It works by sending out sound pulses that then bounce off the bottom of the body of water and return to the depth sounder.

The time it takes for the sound pulse to return allows the depth sounder to measure the depth of the water.

Depth sounders are good for providing information on water depths in shallow areas, and can even detect underwater structures such as rocks, ledges, and holes.

Fish finders use sonar technology to locate and identify fish, as well as determine water depth.

Sonar works by sending out sound waves that penetrate the water column, allowing them to detect fish swimming beneath the surface.

Fish finders also use sound waves to measure water depth and detect structure like a depth sounder does, but with much greater accuracy.

Fish finders are great for locating fish in deep water and can even be used in shallow water to detect changes in water temperature which could indicate where certain types of fish may be found.

Depth sounder vs. transducer

Depth sounders and transducers are both devices used to measure the depth of a body of water. While they are similar in their purpose, they are very different in how they work.

A depth sounder works by sending out a pulse of sound that is reflected off the bottom of the body of water.

The depth is then determined by measuring the time it takes for the sound waves to travel from the surface to the bottom. This type of device is most accurate in shallow waters.

Transducers, on the other hand, use sound waves to measure changes in water pressure. This pressure is directly related to the depth of the water and allows for more accurate measurements in deep water.

When choosing between a depth sounder and a transducer, it’s important to consider the environment you will be operating in.

If you will be operating in shallow water, then a depth sounder may be your best option. However, if you need to measure depth in deeper waters, then a transducer would be your best bet.

Deep Water Happy

Depth sounder / depth meter explanation.

On February 18, 2019
By Kimberly

When sailing school students step on our boats, one of the first questions they ask is how to read and understand the depth meter. And what a good place to start thinking about boating!

How the depth sounder works

The depth meter sends the signal from the transducer at the through-hull fitting to the bottom of the ocean floor. The transducer counts how long the signal takes to go there and bounce back, does some fancy math, and spits out the answer.

Sorting out the numbers

On most of our 30 to 40-foot sailboats, our magic number is three. By that, I mean when the gauge reads three feet, the boat will be aground.

That is because there is three feet clearance between the transducer and the bottom of the keel. That’s not three feet from the waterline, or the top of the freeboard, or even the cabin top. It’s from the transducer to the ocean floor.

Adjusting the readout

The transducer reporting digital readout can be adjusted to read zero when you are aground. I think for years and years, maybe it was not possible to calibrate the device, so maybe everyone got used to the number three meaning aground. Or, if it was possible, it was like setting the blinking time readout on a VCR; just too much trouble.

So, when the transducer reads anything less than three, we are in a panic. If it was set to read that zero means we are aground, we would probably be pulling in and out of our slips actually with anywhere from one to two feet of clearance, but with that readout, we would think we are plowing through mud.

That must be why people are reluctant to calibrate them to read the true depth. Possibly they are reluctant to consult the manual.

Three different ways to measure depth

1. Depth from the top of the water to the sea floor.

To get that depth, you would have to add from the transducer to the waterline.

2. You can have a reading from the transducer to the bottom of the seafloor.

This requires no adjustment. The device comes out the box reading from it to wherever its signal bounces.

3. You could have the instrument read what is actually between the very bottom of your keel and the sea floor.

This would require you subtracted the distance between the bottom of the keel to the transducer in order to get a “clearance only“ read out.

Depth and Anchoring

When you’re anchoring, you are using the depth meter to decide how much scope to lay out.

It’s actually rather misleading to use your depth meter readout to determine scope unless you have it set to read from the bottom to the waterline. The depth of the water is not really 12 feet; it is more likely closer to 15 feet, and then you still need to add another three feet to your depth calculation to add your freeboard!

So, if your depth meter is reading 12 feet, and the transducer is three feet below your waterline; you need to figure for 15 feet. Then you need to add another three feet from your waterline to your anchor roller! That gives you 18 feet times your preferred ratio of line to depth. I guess this is why I always just go ahead and multiply it by 10 instead of seven!

Which do you prefer?

Your depth meter to read actual depth, depth from the transducer, or clearance below the keel? Please leave your comments below.

What to read next: How to Pick up a Mooring Ball

Coming Soon – Anchoring!

Please comment, subscribe, and follow me on Facebook and InstaGram! See you there or on the water!

About Kimberly

Reds and Greens – Distinguishing Channel Markers

THE PRUDENT MARINER // SAFETY AT SEAS SERIES INTRODUCTION // Deep Water Happy

CAPTAIN WORK // CHARTER BOAT TOUR // Deep Water Happy

Nice piece in today’s ASA newsletter!

Thank you so much – I really appreciate your visit!

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What we know so far about Baltimore’s Francis Scott Key Bridge collapse

The Francis Scott Key Bridge in Baltimore collapsed around 1:40 a.m. Eastern time Tuesday after being hit by a cargo ship, with large parts of the bridge falling into the Patapsco River.

The Baltimore Fire Department has labeled the incident a “mass casualty event.” Rescuers were searching for several people, and vehicles were detected in the water.

Here’s what we know so far.

Baltimore bridge collapse

A cargo ship crashed into Baltimore’s Francis Scott Key Bridge, which collapsed overnight. Follow live updates and see photos from the scene .

How it happened: The container ship lost power moments before colliding with the bridge, Maryland Gov. Wes Moore said. The Key Bridge was built in the 1970s and spans the Patapsco River. Rescue efforts remain underway as authorities search for 6 people unaccounted for. Read everything we know so far about the bridge collapse .

Live updates: Baltimore Key Bridge collapses; search continues for 6 unaccounted for 17 minutes ago Live updates: Baltimore Key Bridge collapses; search continues for 6 unaccounted for 17 minutes ago
What we know so far about Baltimore’s Francis Scott Key Bridge collapse 2 hours ago What we know so far about Baltimore’s Francis Scott Key Bridge collapse 2 hours ago
In photos: Baltimore’s Key Bridge collapses after container ship collision Earlier today In photos: Baltimore’s Key Bridge collapses after container ship collision Earlier today

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Cargo ship lost power and issued mayday before hitting Baltimore’s bridge, governor says

Watch live views from Baltimore where a major bridge snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for at least seven people in the water. Read more here: http://apne.ws/HopIwH1

Sunrise shows damage to Baltimore bridge after being rammed by container ship

A container ship lost power and rammed into a major bridge in Baltimore early Tuesday, causing it to snap and plunge into the river below. Several vehicles fell into the chilly waters, and rescuers are searching for survivors. (25 March 2024) (AP video: Rick Gentilo)

A container ship has rammed into a major bridge in Baltimore, causing it to snap and plunge into the river below. Several vehicles fell into the chilly waters early Tuesday, and rescuers searched for survivors. (26 March 2024)

A boat moves past a container ship as it rests against wreckage of the Francis Scott Key Bridge on Tuesday, March 26, 2024, as seen from Pasadena, Md. The container ship lost power and rammed into the major bridge in Baltimore early Tuesday, causing it to snap and plunge into the river below. Several vehicles fell into the chilly waters, and rescuers searched for survivors. (AP Photo/Mark Schiefelbein)

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A container ship as it rests against wreckage of the Francis Scott Key Bridge on Tuesday, March 26, 2024, as seen from Dundalk, Md. The ship rammed into the major bridge in Baltimore early Tuesday, causing it to collapse in a matter of seconds and creating a terrifying scene as several vehicles plunged into the chilly river below. (AP Photo/Matt Rourke)

Parts of the Francis Scott Key Bridge remain after a container ship collided with one of the bridge’s supports Tuesday, March 26, 2024 in Baltimore. The major bridge in Baltimore snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for multiple people in the water. (WJLA via AP)

Maryland Gov. Wes Moore, left, speaks during a news conference as Sen. Chris Van Hollen (D-MD) looks on near the scene where a container ship collided with a support on the Francis Scott Key Bridge, Tuesday, March 26, 2024 in Baltimore. The major bridge in Baltimore snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for multiple people in the water. (AP Photo/Steve Ruark)

Maryland Gov. Wes Moore, center, holds a news conference near the scene where a container ship collided with a support on the Francis Scott Key Bridge, Tuesday, March 26, 2024 in Baltimore. The major bridge in Baltimore snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for multiple people in the water. (AP Photo/Steve Ruark)

From left, Sen. Chris Van Hollen (D-Md.), Bill DelBagno, FBI special agent in charge of the Baltimore field office, Maryland Gov. Wes Moore and Paul J. Wiedefeld, Maryland’s transportation secretary, hold a news conference near the scene where a container ship collided with a support on the Francis Scott Key Bridge, Tuesday, March 26, 2024 in Baltimore. The major bridge in Baltimore snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for multiple people in the water. (AP Photo/Steve Ruark)

A helicopter flies over a container ship as it rests against wreckage of the Francis Scott Key Bridge on Tuesday, March 26, 2024, as seen from Pasadena, Md. The container ship lost power and rammed into the major bridge in Baltimore early Tuesday, causing it to snap and plunge into the river below. Several vehicles fell into the chilly waters, and rescuers searched for survivors. (AP Photo/Mark Schiefelbein)

A container ship rests against wreckage of the Francis Scott Key Bridge on Tuesday, March 26, 2024, as seen from Pasadena, Md. The container ship rammed into the major bridge in Baltimore early Tuesday, causing it to collapse in a matter of seconds and creating a terrifying scene as several vehicles plunged into the chilly river below. (AP Photo/Mark Schiefelbein)

FILE - The vessel Zhen Hua 13, carrying four giant shipping cranes for delivery and installation at the Port of Baltimore, passes under the Francis Scott Key Bridge in Baltimore, Wednesday, June 20, 2012. A portion of the Francis Scott Key Bridge in Baltimore collapsed after a large boat collided with it early Tuesday, March 26, 2024 in the morning, and multiple vehicles fell into the water. Authorities were trying to rescue at least seven people. (AP Photo/Patrick Semansky, File)

Follow AP for live coverage of Baltimore’s Key Bridge collapse

BALTIMORE (AP) — A container ship lost power and rammed into a major bridge in Baltimore early Tuesday, causing the span to buckle into the river below and plunging a construction crew and several vehicles into the dangerously cold waters. Rescuers pulled out two people, but six others were missing.

The ship’s crew issued a mayday call moments before the crash took down the Francis Scott Key Bridge, enabling authorities to limit vehicle traffic on the span, Maryland’s governor said.

The ship struck one of the bridge’s supports, causing the structure to collapse like a toy. It tumbled into the water in a matter of seconds — a shocking spectacle that was captured on video and posted on social media. The vessel caught fire, and thick, black smoke billowed out of it.

With the ship barreling toward the bridge at “a very, very rapid speed,” authorities had just enough time to stop cars from coming over the bridge, Maryland Gov. Wes Moore said.

“These people are heroes,” Moore said. “They saved lives last night.”

The crash happened long before the busy morning commute on the bridge that stretches 1.6 miles (2.6 km).

The six people still unaccounted for were part of a construction crew filling potholes on the bridge, said Paul Wiedefeld, the state’s transportation secretary said. One of those rescued was taken to a hospital, he said.

“Never would you think that you would see, physically see, the Key Bridge tumble down like that. It looked like something out of an action movie,” said Baltimore Mayor Brandon Scott, calling it “an unthinkable tragedy.”

The collapse is almost sure to create a logistical nightmare for months, if not years, along the East Coast, shutting down ship traffic at the Port of Baltimore and snarling cargo and commuter traffic.

“Losing this bridge will devastate the entire area, as well as the entire East Coast,” state Sen. Johnny Ray Salling said.

Highway signs as far south as Virginia warned drivers of delays associated with the closure of the bridge.

Authorities said sonar had detected vehicles in the water, which is about 50 feet (15 meters) deep. The water temperature was about 47 degrees Fahrenheit (8 degrees Celsius) before dawn Tuesday, according to a buoy that collects data for the National Oceanic and Atmospheric Administration.

Here’s what to know:

Agencies received emergency calls around 1:30 a.m. local time reporting that a ship leaving Baltimore had struck a column on the bridge.
The operators of the cargo ship lost power and issued a mayday call moments before the vessel crashed, Maryland’s governor said.
Multiple people have been pulled from the water; the search for others is ongoing .

Read more: A list of major US bridge collapses caused by ships and barges.

Earlier, Kevin Cartwright, director of communications for the Baltimore Fire Department, told The Associated Press that several vehicles were on the bridge at the time of the collapse, including one the size of a tractor-trailer truck. The bridge came down in the middle of night when traffic would be lighter than during the day when thousands of cars traverse the span.

Synergy Marine Group — which manages the ship, called the Dali — confirmed the vessel hit a pillar of the bridge at about 1:30 a.m. while in control of one or more pilots, who are local specialists who help navigate vessels safely into ports. The ship is owned by Grace Ocean Private Ltd.

It said all crew members, including the two pilots on board, were accounted for, and there were no reports of any injuries.

AP AUDIO: Cargo ship hits Baltimore’s Key Bridge, bringing it down. Rescuers are looking for people in water.

AP correspondent Donna Warder reports on the search for victims following a bridge collapse in Baltimore.

Baltimore’s Francis Scott Key Bridge collapse is shown early morning, Tuesday, March 26, 2024 from Riviera Beach, Md. (AP Photo/Nathan Ellgren)

The ship was moving at 8 knots, roughly 9 mph (14.8 kph), the governor said.

As the sun rose Tuesday, jagged remnants of the bridge could be seen jutting up from the water’s surface. The on-ramp ended abruptly where the span once began.

Cartwright said that some cargo appeared to be dangling from the bridge, which spans the Patapsco River at the entrance to a busy harbor. The river leads to the Port of Baltimore, a major hub for shipping on the East Coast. Opened in 1977, the bridge is named for the writer of “The Star-Spangled Banner.”

Maryland Transportation Secretary Paul Wiedefeld said all vessel traffic into and out of the port would be suspended until further notice, though the facility was still open to trucks.

The governor declared a state of emergency and said he was working to get federal resources deployed. The FBI was on the scene, but said there was no credible information to suggest terrorism. President Joe Biden was briefed.

Parts of the Francis Scott Key Bridge remain after a container ship collided with a support Tuesday, March 26, 2024 in Baltimore. (WJLA via AP)

The Dali was headed from Baltimore to Colombo, Sri Lanka, and flying under a Singapore flag, according to data from Marine Traffic. The container ship is about 985 feet (300 meters) long and about 157 feet (48 meters) wide, according to the website.

Danish shipping giant Maersk said it had chartered the vessel. No Maersk crew and personnel were on board. The collapse caused Maersk share at the Nasdaq Copenhagen to plummet 2% in early Tuesday trading.

Last year, the Port of Baltimore handled a record 52.3 million tons of foreign cargo worth $80 billion, according to the state. In addition to cargo, more than than 444,000 passengers cruised out of the port in 2023.

This story has been corrected to show that Grace Ocean Private owns the ship, not Synergy Marine Group.

Baltimore's Key Bridge collapses after ship hits it; construction crew missing: Live Updates

BALTIMORE − A massive search effort was underway Tuesday for six construction workers who were on the Francis Scott Key Bridge in Baltimore when it was struck by a large cargo vessel and collapsed into the Patapsco River, shutting down a critical artery for East Coast shipping, authorities said.

Around 1:30 a.m. a vessel leaving the Port of Baltimore struck the Key Bridge, causing it to collapse in a matter of seconds. Officials said the crew warned of a power issue and sent out a "mayday" before the collision. Footage of the incident shows the cargo ship smash into one of the columns before the bridge snapped, hit the water and partially fell on the ship, where a burst of flames and smoke could be seen rising into the night sky.

Several vehicles were on the bridge at the time of impact and were plunged into the Patapsco River, which was measured Tuesday at temperatures cold enough to cause hypothermia. There were also multiple contractors on the bridge who were repairing potholes, said Maryland Transportation Secretary Paul Wiedefeld. So far two people have been rescued. One was unharmed and the other remains in "very serious condition," he said.

The crew that was on the ship when it collided with the bridge remained on the vessel, which needed to be assessed for damage before rescuers could board it, said James Wallace, chief of the Baltimore City Fire Department. The vessel was carrying cargo for the major shipping company Maersk and was headed for Sri Lanka.

A senior U.S. official told USA TODAY that the ship apparently lost power a few minutes before striking the bridge. Authorities have not stated an official cause for the crash but Maryland Gov. Wes Moore said in a news conference the crew notified authorities “of a power issue" as it was traveling about 9 miles per hour. He said the crash seems to be an "accident" and added that the bridge was "up to code."

Moore said once the mayday was issued, officials on site stopped cars from coming over the Francis Scott Key Bridge. "These people are heroes," he said, "they saved lives last night."

'It's devastating to the city'

Greg Trenchard, 43, awoke Tuesday to a flurry of text messages and missed calls from his out of state relatives checking in on him after hearing about the Key Bridge collapse.“I’ve driven over it 100 times and now to see that it’s gone is pretty crazy,” he said Tuesday.Trenchard, an auditor, said he then tried to make his way to Fort Armistead Park, where he’d come many times before to take photos of the bridge at sunrise and sunset. But the normally quick drive took nearly 40 minutes due to the traffic detours, and a police roadblock next to Royal Farms, a convenience store, about a mile and half from the park stopped him from getting any closer to the scene“It’s a blow,” he said of the collapse. “It’s devastating to the city, it’s devastating to port traffic and everything they’re trying to do to revitalize the shipping industry in Maryland and keep that going.”

– N'dea Yancey-Bragg

Air, land and water search underway

Multiple local, state and federal agencies are coordinating the massive search, which spans a vast section of the river – both above and below the surface of the water – and the ship itself, Wallace said. Divers, helicopters and sonar technology were being used and had located several vehicles submerged in the river, which is about 50-feet-deep where the bridge collapsed.

"This water is current influenced, so right now we think the tide is coming back in," he said.

Wes Moore, the governor of Maryland, declared a state of emergency and said he is working with an interagency team to "quickly deploy federal resources from the Biden Administration."

"This is an unthinkable tragedy," Baltimore Mayor Brandon Scott said at a news conference.

President Joe Biden has been briefed on the collapse and the ongoing search and rescue efforts, the White House said, adding that he will continue to receive updates from his team throughout the day.

Expert says river current makes search more difficult

Jim Bellingham, the executive director for the Johns Hopkins Institute for Assured Autonomy and expert in marine robotics lives in nearby Fells Point and talked to USA TODAY about some of the challenges faced by rescuers.

“Nothing is staying put in the ocean,” he said. “Everything is moving” in the Patapsco River, a tidal estuary, which presents just one difficulty for rescue efforts. Rescuers would have to determine the speed and direction of the current to figure out where to search – toward Baltimore Harbor, or out toward the Chesapeake Bay.

Bellingham said it’s likely any workers who may have been on the bridge would have been wearing reflective vests and even flotation devices that would improve visibility in the dark river. They might also have flares, and are more easily spotted by rescue helicopters.

Rescuers are using sonar, lights, cameras and robotic machinery, as well as human divers, but Bellingham said divers would face their own risks, as the wreckage might not be stable.

The longer the search goes on, the less likely rescuers are to find survivors, given the temperature of the water, and the likelihood of people being trapped with little to no air. But Baltimore, with many Navy and Coast Guard facilities and military contractors nearby, might be as well prepared to deal with the disaster as any place.

“Their job is to rescue people,” Bellingham noted. “They want to believe they can do that, and there’s a tendency not to want to give up.”

– Phaedra Trethan

Cargo ship was headed for Sri Lanka

The container vessel was chartered by the major shipping company Maersk and was carrying its cargo, according to a statement from the company. When it crashed into the bridge, no Maersk crew and personnel were onboard the vessel, which is operated by charter vessel company Synergy Group and owned by Singapore-based Grace Ocean Pte.

The Dali was slated to arrive later this week in Sri Lanka, according to MarineTraffic, a global ship tracking service.

"We are horrified by what has happened in Baltimore, and our thoughts are with all of those affected," Maersk said in a statement. "We are closely following the investigations conducted by authorities and Synergy, and we will do our utmost to keep our customers informed."

Synergy Marine Corp said the Dali collided with one of the pillars of the bridge and that all its crew members, including two pilots, have been accounted for and there were no reports of any injuries.

U.S. Coast Guard Lt. Cmdr. Erin Palmer said at a news conference Tuesday that the agencies remains focused on search-and-rescue. She did not comment on the crew of the ship or provide additional details about the collision.

All vessel traffic in and out of the Port of Baltimore is suspended until further notice, but the port is still open for truck transports, Wiedefeld said. Traffic, meanwhile, is being diverted from the area around the Key Bridge.

Baltimore port closed to ships 'until further notice'

Shortly after the bridge collapse, the Port of Baltimore suspended vessel traffic “until further notice,” according to its website.

“This does not mean the Port of Baltimore is shut down. We are still processing trucks inside of our terminals,” the statement said.

But Bloomberg reported that the port “looks to be out of commission indefinitely.”

At least 40 ships are now more or less trapped inside the port, according to Reuters. At least 30 other ships planned to arrive there.

“They will likely have to reroute shipping to other ports on the East Coast,” said Kevin Linderman, a professor and supply chain expert at Pennsylvania State University. “However, this will put additional demand on these ports, and shippers may not be able to access US markets” as efficiently, he said.

“One critical question is, can the other ports handle the products that were destined to Baltimore?”

– Daniel de Visé

Baltimore bridge collapse impacts on cruises

Baltimore is a destination for several major cruise lines. According to the Cruise Lines International Association, the industry’s leading trade group, published itineraries in the 2024 calendar year include a dozen ships making 115 stops in Baltimore.

Royal Caribbean and Carnival have April sailings that could be impacted by the bridge collapse, according to their websites.

A spokesperson for Carnival told USA TODAY it was premature to comment on impacts to future sailings.

American Cruise Lines has roundtrip sailings from Baltimore scheduled in May, according to its website. A spokesperson for the cruise line told USA TODAY their schedules remain unaffected but will make adjustments if needed to future cruises.

Norwegian Cruise Line doesn’t appear to have any Baltimore sailings until September.

– Eve Chen and Nathan Diller

Will the port shutdown affect consumer goods, prices?

Several big firms have distribution warehouses near the port, including Amazon and FedEx, one analyst noted in a tweet on X.

Even so, some analysts predict only a minimal impact on the movement of goods up and down the East Coast from the bridge collapse.

Baltimore’s port holds just 4% of all East Coast trade volume, according to S&P Global. New York’s port, by contrast, does 38% of that business.

Yet, the port offers the deepest harbor in Maryland’s Chesapeake Bay, is closer to the Midwest than any other East Coast port, and is within an overnight drive of one-third of the US population, according to the port website .

The port boasts five public and 12 private terminals. In 2023, it ranked first in the nation in handling automobiles and light trucks.

“For the American consumer, the biggest impact will be felt in terms of imported motor vehicles,” said Jason Miller, a business professor at Michigan State University. If sales remain strong, he said, “we could see inventories drop on the lots of dealers that sell imported vehicles until alternative arrangements can be made. This could increase motor vehicle prices for some makes and models.”

Alternate routes around collapsed Baltimore bridge

Maryland Transportation Authority is suggesting drivers take Interstate 95 or Interstate 895 as alternatives to the collapsed Francis Scott Key Bridge along Interstate 695.

“I-695 Outer Loop closed at MD 10 (exit 2) and Inner Loop closed at MD 157/Peninsula Exp (exit 43),” MDTA said in a post on X.

Drivers could take several other, longer routes around Baltimore, but I-95 (Fort McHenry Tunnel) and I-895 (Baltimore Harbor Tunnel) are the most direct alternatives across the water.

There are few exceptions.

MDTA notes, vehicles carrying hazardous materials, including more than 10 pounds of propane, are not allowed in the tunnels. Additionally, vehicles more than 13-feet and 6-inches high or 8-feet wide may not use the 1-895 Baltimore Harbor Tunnel. Vehicles more than 14-feet and 6-inches high or 11-feet wide may not use the I-95 Fort McHenry Tunnel.

Those vehicles should use the western portion of I-695 instead.

How cold is the Patapsco River?

The Patapsco River is about 50 feet deep where the ship hit the bridge, officials said during a press conference Tuesday morning. Part of the 39-mile river helps form the Baltimore Harbor, just northwest of the bridge collapse, and it flows out to the Chesapeake Bay.

A buoy in the Patapsco River indicated the water temperature Tuesday morning was currently about 47 degrees, while the air is around 41 degrees, according to the National Oceanic and Atmospheric Administration . Whereas hypothermia is thought to occur at very cold temperatures, it can occur in waters below 70 degrees, according to the Centers for Disease Control and Prevention .

-Eduardo Cuevas

Key Bridge collapse draws comparisons to Florida's Sunshine Skyway Bridge collapse

In 1980, a Florida bridge also collapsed after a ship collided with it, leading to the deaths of 35 motorists and bus passengers.

A 1,200-foot chunk of the Sunshine Skyway bridge – which connects St. Petersburg and Bradenton – collapsed after the massive Summit Venture freighter slammed into one of its central support piers.

When the section of the bridge fell into Tampa Bay, it took a truck, seven cars and a Greyhound bus with it.

The Herald-Tribune, part of the USA TODAY Network, reported the crash happened during an intense thunderstorm , with winds reaching 80 mph and heavy rain. At the time, visibility was near-zero, according to local historians who made a documentary film about the collapse.

After the collapse, the freighter remained stuck beneath the bridge, with part of the roadway on top of its bow. Photos from the time also show how one motorist was able to skip his car to a stop just inches away from where the bridge fell into the water.

-Claire Thornton

How vital is the Francis Scott Key Bridge?

The Francis Scott Key Bridge, named for the author of the "Star Spangled Banner," is a 1.6-mile, 4-lane bridge that crosses over the Patapsco River, according to the MDTA. It opened in 1977.

The port’s private and public terminals handled 847,158 autos and light trucks in 2023, the most of any U.S. port. The port also handles farm and construction machinery, sugar, gypsum and coal, according to a Maryland government website.

The span is the outermost of three major Patapsco River crossings at Baltimore Harbor, according to the American Civil Engineering Society. The steel-arched bridge, with a total length of 8,636 feet, was the second-longest continuous-truss bridge span in the world when it was built and remains the second longest in the United States and third in the world, according to the society .

Contributing: Reuters; Tom Vanden Brook, USA TODAY

Francis Scott Key Bridge collapse live updates: Ship hits major Baltimore bridge with construction crew on it

What we know.

A major bridge in Baltimore partially collapsed overnight after it was hit by a cargo ship, authorities said. A representative from Brawner Builders Inc. told NBC News that the company had a construction crew on the Francis Scott Key Bridge when it collapsed. Maryland Transportation Secretary Paul Wiedefeld said the crew was fixing potholes.
A search was underway this morning for at least six people who were feared to have been sent plunging into the river, the city's fire chief said, while two people were rescued. Sonar was used to detect vehicles submerged in the water, he added. Authorities believe the eight people were all part of the construction crew.
The Francis Scott Key Bridge, which carries Interstate 695 over the Patapsco River, was hit by the 948-foot Dali container ship, the U.S. Coast Guard told NBC News.
Between the mayday call and the collapse of the Key Bridge, officials were able to stop the flow of traffic from continuing onto the collapsed bridge, Maryland Gov. Wes Moore said, adding that the call "saved lives."
Dramatic video shows the moment the bridge appears to snap and then tumble into the river after the vessel collides with one of its supporting structures.

Teen describes being awakened by Baltimore bridge collapse

Baltimore resident Kayleigh Gray, 14, was startled awake early Tuesday when she heard “a real loud boom” and her bed started shaking as a cargo ship slammed into the Francis Scott Key Bridge.

“Since I was asleep, my grandmother woke me up and said, ‘The bridge is gone.’ I said, ‘What are you talking about?’ She said, ‘The ship hit it.’ I said, ‘There’s no way. You’re’ lying,” Gray told NBC News correspondent George Solis. Her grandmother then showed her video footage of the devastating crash.

She said she and her family go over that bridge every day. Her first thoughts went to the people impacted.

“I was worried about the families to be honest ... I called friends. We called friends and family seeing who was on the bridge. Because my grandfather, he’s supposed to go over that bridge every day. He’s a truck driver. He was supposed to be on that bridge today around 7:30 a.m.,” Gray said.

She said the bridge means "a lot" to people who grew up in the area and hopes that it'll be rebuilt.

Worker recently moved off bridge repair is in 'shock'

Melissa Chan

A construction worker who was recently moved off a project to repair the bridge is in “shock” as he waits for news on at least six of his colleagues who are now missing.

James Krutzfeldt, 34, a foreman for Brawner Builders, told NBC News he was working on the bridge about two weeks ago. One of his colleagues who was unaccounted for Tuesday morning is another foreman who Krutzfeldt considers his mentor and “work dad.”

“We’re all just waiting for a phone call,” he said. “It’s all up in the air. We’re waiting on our boss and owner to break it down to everybody.”

At least seven workers were pouring concrete to fix potholes on the roadway on the bridge directly above where the ship hit, Krutzfeldt said.

That repair project has been going on for about four years, he said. “We all bounce around,” he said. “It’s sad. I haven’t really realized it yet. I’m still kind of in shock.”

President Biden addresses Key Bridge collapse after briefing

Kyla Guilfoil

Biden was briefed on the collapse of the Francis Scott Key Bridge Tuesday morning by senior members of his team, according to a post to his X account.

The president emphasized that the White House is committed to supporting the response to the collapse.

"I’ve directed my Administration to ensure every federal resource is available to assist search and rescue efforts and response to this terrible incident," the post read.

Biden is scheduled to speak at 12:30 ET on the collapse.

‘Could never imagine:’ Baltimore resident describes moment he heard bridge collapse

BALTIMORE — A resident of suburban Baltimore who can see the Francis Scott Key Bridge from his backyard said he woke up in the middle of the night to his home shaking.

"I could have never, never imagined that it was the Key Bridge that had just collapsed," Georgio Comninos said. "I thought it was perhaps like a really low flying, maybe a military jet, perhaps a small earthquake however unlikely that is in Baltimore."

He questioned why the bridge collapsed so quickly after its collision with the cargo ship.

"I mean, was this thing held up with toothpicks?" Comninos asked. "What’s the deal?

Maersk pauses shipping through Baltimore port

Maersk, a shipping company with vessels in the Baltimore port, released a new customer advisory pausing its shipping through the Helen Delich Bentley Port of Baltimore for the time being.

The company said that it would be "omitting Baltimore on all our services for the foreseeable future, until it is deemed safe for passage through this area."

"We are deeply concerned by this incident and are closely monitoring the situation," Maersk's advisory said.

NTSB to hold press conference on bridge collapse

Marlene Lenthang

The National Transportation Safety Board will hold a press conference at 1 p.m. ET on the investigation into the Francis Scott Key Bridge collapse.

Size of ship negated any measures meant to deflect ships, Johns Hopkins professor says

Jason Abbruzzese

The ship that hit the Francis Scott Key Bridge was big enough that any safety measures meant to try to limit the impact of a collision would have been rendered ineffective, according to Benjamin Schafer, a professor of civil and systems engineering at the nearby Johns Hopkins University.

He stressed that any failure in this situation is centered on the broader issue of maritime safety and infrastructure development.

He said that container ships like the Dali are “a different animal” when it comes to dealing with safety and collisions. "I’m afraid that this is not something that any bridge would be designed to withstand," he said. "We need to make sure this collision does not happen."

"Where’s lessons to be learned here about about how we manage our infrastructure that we need to learn quickly," he added.

Buttigieg to travel to Baltimore

Jay Blackman

Transportation Secretary Pete Buttigieg will go to the Francis Scott Key Bridge collapse today to receive updates at the invitation of Moore.

Workers on the bridge fixing potholes at time of collapse, transportation secretary says

Yuliya Talmazan

There were workers on the Key Bridge fixing potholes at the time of the collapse, Maryland Transportation Secretary Paul Wiedefeld told reporters in a briefing this morning.

Rescue teams continue looking for six people after two were rescued overnight, he said.

Royal Caribbean says its searching for alternatives to Port of Baltimore

Matt Lavietes

Royal Caribbean said it is searching for alternative ports for its cruise ships scheduled to go in and out of the Port of Baltimore, the 29th largest cruise port in the U.S.

"We are deeply saddened by the tragedy and collapse of the Francis Scott Key Bridge and extend our heartfelt prayers to all those impacted," a spokesperson for the cruise line said in a statement. "We are closely monitoring the situation, and our port logistics team is currently working on alternatives for Vision of the Seas’ ongoing and upcoming sailings."

"Any updates will be communicated to our guests and travel partners once our plans are finalized," the spokesperson added.

Dali crew members notified authorities they lost power, governor says

Moore told reporters this morning that crew members of the Dali container ship that collided with the Key Bridge this morning had notified authorities that they had a power issue.

Biden expected to address bridge collapse today

Monica Alba

President Joe Biden is expected to address the Baltimore bridge collapse before he departs for North Carolina today, a White House official confirmed to NBC News.

Reconstruction of the bridge will be a 'long-term build,' governor says

Moore said reconstructing the collapsed Key Bridge will be a "long-term build."

"It's going to be a build that's going to require every facet and every aspect of our society. It is something that I can tell you we are going to get this done," he said, adding that he can't comment on the time and money it would take as the focus for now remains on saving lives.

Baltimore county executive addresses collapse

Baltimore County Executive Johnny Olszewski called the collapse "devastating" and said his "first and most important priority" is to search for and rescue survivors.

"In the days and weeks ahead there will be many questions about the impact of this incident on our families, regional traffic and commerce," he said in a statement released on X. "We will work closely with state and federal partners to make sure we are doing all we can to support everyone impacted."

Olszewski also thanked first responders and called on the Baltimore community to use the tragedy as an opportunity to come together.

Cruise Lines International Association monitoring bridge collapse

The Cruise Lines International Association, the largest cruise industry trade association, said it is “closely following” the Baltimore bridge collapse.

“We are deeply saddened by the tragedy and collapse of the Key Bridge that occurred last night and extend our support and heartfelt prayers to all those impacted,” a statement said. “We join everyone in extending our thanks and appreciation to the first responders and emergency workers in Baltimore, the U.S. Coast Guard, and other professionals who are working with one goal in mind — to save lives.”

The Port of Baltimore is the 29th largest cruise port in the U.S.

“Any adjustments to current cruise activity at the port will be announced as soon as available by the individual cruise lines,” the association said.

Maryland governor: 'We are Baltimore strong'

Moore appeared to try to motivate and reassure Marylanders shortly after addressing reporters for the first time since the collapse.

"In the face of danger, we hold out. In the face of heartbreak, we come together, and we come back stronger," Moore wrote on X. "That is what we’ve always done. That’s what we will continue to do."

The governor — who was elected in 2022 — also commended first responders and commended what he described as quick coordination among local, state and federal government agencies.

"Our administration is working closely with leaders at all levels of government and society to respond to this crisis," Moore wrote. "Not just by addressing the immediate aftermath, but also by building a state that is more resilient and more safe."

Vehicles were stopped from getting onto the bridge after collapse, saving lives, Maryland governor says

Between the mayday call and the collapse of the Key Bridge, officials were able to stop the flow of traffic from continuing onto the collapsed bridge, Moore told reporters this morning.

He warned that the investigation is still ongoing and they don't have full details, but that the response may have prevented more casualties. Six people were unaccounted for and two had been rescued, according to authorities.

"Many of the vehicles were stopped before they got onto the bridge, which saved lives," Moore said.

'We stand ready to support Baltimore,' D.C. mayor says

Washington, D.C., Mayor Muriel Bowser offered prayers for “all those impacted by the collapse of the Francis Scott Key Bridge.”

“This morning, I reached out to Mayor Scott, and we stand ready to support Baltimore in these difficult days ahead,” she wrote on X .

Earlier this morning, the mayor had responded "Oh no," to a tweet sharing video of the bridge collapse, which was met with a flurry of mocking tweets by other X users.

University of Maryland hospital said it received one patient following collapse

The University of Maryland Medical Center received a patient at its trauma center following the collapse, Michael Schwartzberg, a spokesperson for the hospital, said in a statement.

He did not disclose the patient's condition, but added that the person has already been discharged.

'Our state is in shock': Maryland governor says no credible evidence of terror attack

The preliminary investigation of the Key Bridge collapse points to an accident, and there is no credible evidence of a terror attack, Moore told reporters in a briefing.

"This morning, our state is in shock," he said, adding that the response teams are doing everything in their power to rescue and recover victims of the collapse. "To the victims of this tragedy and their loved ones: All of our hearts are broken," he said.

The FBI in Baltimore also said there was "no specific and credible information to suggest any ties to terrorism at this time." The investigation is ongoing, the FBI said on X.

The steel frame of the collapsed Francis Scott Key Bridge sits on top of a container ship, in Baltimore

Brawner Builders confirms it had a crew on Key Bridge at time of collapse

A representative from Brawner Builders Inc. told NBC News that the company had a construction crew on the Francis Scott Key Bridge when it collapsed.

The company declined to give further details, including how many employees were working at the time of the crash or are still missing.

Earlier this morning, NBC News spoke with the daughter-in-law of Miguel Luna, a Brawner Builders construction worker who was on the bridge. She declined to be interviewed, but did share that she went to the convenience store closest to the bridge’s road closure after receiving a call about the accident to try to get information. As of this writing, she still has not heard any news about her relative from authorities.

Maryland senator calls collapse 'a terrible tragedy'

Sen. Chris Van Hollen, D-Md., today called the Francis Scott Key Bridge collapse “a terrible tragedy for our City and our State.”

“I’m praying for those who were on the bridge, and I know there are urgent rescue efforts still underway. I’m thankful for the first responders and emergency crews who are at the scene and are working tirelessly on these efforts,” he said.

Van Hollen said he was heading to Baltimore and is closely monitoring the situation, and has been in touch with the governor and local officials.

“We are quickly working to address this situation, and I know, as always, Baltimore will come together, united to face this tragedy.”

Baltimore mayor declares state of emergency

Scott officially declared a local state of emergency in response to the collapse.

"Our teams are mobilizing resources and working swiftly to address this crisis and ensure the safety and well-being of our community," he said in a post o n X.

The declaration went into effect at 9 a.m. ET today and will remain in effect for 30 days, according to the mayor's executive order.

More than 11 million vehicles pass over Francis Scott Key Bridge every year

Crystal Minaya

The Francis Scott Key Bridge, which runs through the area, sees 31,000 vehicles pass on it a day — or 11.3 million a year, according the Maryland Transportation Authority.

What is the Port of Baltimore?

The Port of Baltimore is the deepest harbor in the Chesapeake Bay and is the No. 1 port in the country for handling automobiles.

Last year, it handled 847,158 cars and light trucks, the 13th year in a row it has led all other U.S. ports in handling auto commodities, according to the state .

It's ranked ninth nationally based on the value of its cargo. Last year, it handled 52.3 million tons and $80.8 billion worth of foreign cargo.

Cruise ships, such as Carnival, Royal Caribbean and Norwegian, also sail out of the port.

Close-up photos reveal extent of bridge damage

Max Butterworth

Images released by the Baltimore City Fire Department reveal close detail of the damage caused to the Francis Scott Key Bridge in Baltimore, after it was struck by a cargo ship this morning.Another image shows a section of the stricken cargo ship’s bow, which was violently ripped apart by the collision.

NTSB to send team to Baltimore

The National Transportation Safety Board is sending a team to Baltimore today.

Chair Jennifer Homendy will be in attendance as the NTSB's spokesperson.

What was happening to the Dali ship moments before bridge collapse?

Bianca Britton

A livestream of the Key Bridge collapse early this morning sheds some light on what was happening with the Dali as the ship neared the bridge.

Around 1:24 a.m. ET, the ship's lights turn off but only a minute later come back on. Then 10 seconds later, dark black smoke can be seen billowing from the ship's chimney. At 1:26 a.m., the ship appears to turn and moments later loses its lights again. They come back on half a minute later.

At 1:28 a.m., the ship can be seen making impact with the bridge, followed by the span's complete collapse.

Pride and emotion as Baltimore resident says goodbye to beloved bridge

To the people of Maryland, this was more than just a bridge — it was a symbol of local pride.

"I was always proud because of being from Baltimore, that was one of the proud things that we built that, you know, and it [was] still standing," Chantel Debord, who lives in Baltimore, said in an interview with NBC News.

"And just being able to say that our port is one of the reasons why the East Coast over here gets a lot of their product," she added.

Debord predicted that taxes could rise, plus the region could see a big hit to its fishing industry, as well as longer commutes.

Her reaction was infused with a profound sense of loss. "It’s sad to see that it’s gone. A lot of hard work in there. A lot of Baltimore people have built it, and people from Maryland, and it’s completely gone," she said.

"People lost their lives and now people are gonna lose their livelihoods."

Debord asked her daughter to take pictures as the pair drove over the bridge two weeks ago, not knowing it would be their last time.

An image taken crossing the Francis Scott Key Bridge in Baltimore, Md.

'It's just not there': Shocked local responds to collapse of famous bridge

DUNDALK — Local residents have spoken of the shock of seeing such a famous landmark, a mainstay in the area for generations, suddenly vanish from view.

William Reynolds, from Dundalk, Maryland, a town immediately north of the bridge, described hearing a sound "like a tractor trailer hitting the wall" this morning and came to see it for himself at 5:30 a.m. He lives a 2-minute walk away, off the first exit after the bridge.

"It’s literally at the end of the street, you see it coming home every day, pouring into your neighborhood, and now it’s just not there," he told NBC News.

"My parents are on the other side of that bridge, you know, everybody that you know comes back and forth over that bridge even late at night or early in the morning," he said.

After the immediate shock, Reynolds' thoughts soon turned to increased driving times of 45 minutes or more that drivers will face going through the congested city or using the busy I-95 to complete what until early this morning was a simple journey.

"It’s just not there — like the video is real, like, it’s not there," he said.

Aerial footage reveals scale of bridge collapse

A cargo ship collided with the Francis Scott Key Bridge in Baltimore, in the early hours of today.

No-fly zone established in area of bridge collapse

A no-fly zone has been established in the area around the Baltimore bridge collapse, effective until further notice.

Drones are also not allowed to fly in the area, the Federal Aviation Administration said.

“Do not interfere with rescue operations. If you fly, emergency response operations cannot,” the FAA said in a warning on X.

Water temperature in the harbor is around 47 degrees

The water temperature in the Patapsco River at the site of the Key Bridge collapse this morning is currently around 47 degrees Fahrenheit, according to buoy data from the National Oceanic and Atmospheric Administration.

A number of people are feared to have fallen into the water after the bridge collapsed, though details are unclear.

Hypothermia can occur in any water temperature below 70 degrees, according to the Centers for Disease Control and Prevention.

Biden briefed on bridge collapse

Elyse Perlmutter-Gumbiner

President Joe Biden has been briefed on the Francis Scott Key Bridge collapse in Baltimore and ongoing search and rescue efforts, a White House official said today.

"He will continue to receive updates from his team throughout the day," the official said.

Reconstruction 'could cost 10 times more' than the $60 million build price, leading British engineer says

Henry Austin

Reconstruction of the Key Bridge could cost over 10 times more than the $60 million it cost to construct it in 1977, a leading British engineer told NBC News today.

David MacKenzie, senior director of COWI, a British engineering and architecture consultancy firm, said the bridge could be reconstructed in two years “if people get their skates on.”

“It has to be built quickly because of the pressure on commuter traffic, so procurement will have to be shortcut, so it will be a very expensive rebuild,” added MacKenzie, a long span bridge engineer.

He said that “there was nothing unusual about the bridge,” before it collapsed and there “was some ship impact protection in the form of big concrete obstacles. But the ship which crashed into the bridge has “somehow got past those,” he said.

Container ships when the bridge was built in 1977 “were a lot smaller than they are now,” he said, adding that a risk assessment should have picked up on the dangers posed by modern vessels.

People would expect the new bridge “to be more robust,” he added.

It would likely take a matter of weeks to clean up the debris, he said, adding that the larger pieces would probably be blown up into smaller pieces and then collected by a crane ship.

Ship's managing company says all 22 crew members accounted for

The managing company of the ship that collided with the Key Bridge this morning said that all 22 crew members on board, including two pilots, have been accounted for and there were no reports of any injuries.

In a statement to NBC News, Synergy Marine Group said the owners and managers of the Dali container ship, which was bound for Sri Lanka, were fully cooperating with federal and state government agencies.

The company added that the exact cause of the incident is yet to be determined.

Bridge collapse revealed in daylight images

The steel frame of the Francis Scott Key Bridge sits on top of the container ship after it struck the span in Baltimore, this morning.

The bridge collapsed after being struck by a container ship, sending multiple vehicles and up to 20 people plunging into the harbor below.

Bridge collapse an 'unthinkable tragedy,' mayor says as workers' fate remains unknown

As loved ones of workers believed to have been on the bridge during the collapse gathered nearby earlier today, there was still no official confirmation of their fate.

"We were being told there were workers on the bridge, we have yet to confirm that," Baltimore City Fire Department Chief James Wallace told reporters this morning.

At the same news conference, Baltimore Mayor Brandon Scott called the incident "an unthinkable tragedy."

White House is monitoring bridge collapse

The White House is monitoring the bridge collapse and is in touch with the Maryland governor and the Baltimore mayor to offer federal assistance, a White House official told NBC News.

The official also said there does not appear to be any evidence that the collapse is the result of "nefarious intent."

"Our hearts go out to the families of those who remain missing as a result of this horrific incident," the official said.

Sonar detects vehicles submerged in the water after bridge collapse, fire chief says

Sonar has been used to detect the presence of vehicles submerged in the water after the bridge collapse this morning, but emergency crews don’t have a count of exactly how many yet, Baltimore City Fire Department Chief James Wallace said in his briefing with reporters.

He said there were likely multiple people on the bridge at the time of the collapse, and as a result, likely multiple people in the water.

Baltimore Fire Department Chief James Wallace

Crews are still very much in an active search and rescue stage, Wallace added, and will continue to be for some time, searching both above and below water, as well as on the deck of the ship that hit the bridge.

The crews are using different types of sonar capabilities, underwater drones and infrared technology, he said.

Search underway for at least 7 people after bridge collapse, fire chief says

Rescue teams are looking for at least seven people after the Key Bridge collapse, Baltimore City Fire Department Chief James Wallace has said in a briefing with reporters.

He said it's a "dynamic count" that they have not nailed down yet, as the search and rescue operation continues.

Two people were rescued after the collapse, Wallace said, with one in serious condition.

Maryland governor declares state of emergency after bridge collapse

Jesse Rodriguez

Moore has declared a state of emergency after the Key Bridge collapse, saying he is working with an interagency team to quickly deploy federal resources.

"We are thankful for the brave men and women who are carrying out efforts to rescue those involved and pray for everyone’s safety," he said in a statement.

Loved ones of people working on the bridge at the time of collapse gather nearby

Julia Jester

BALTIMORE — A group of people who say they are family members of workers employed by Brawner Builders Inc. have gathered at a Royal Farms convenience store near the entrance of the Francis Scott Key Bridge.

They say their loved ones were working on the bridge at the time. One woman told NBC News her father-in-law, Miguel Luna, was among the workers.

They went to the store because it was the closest they could get to the bridge, but they have yet to get any formal guidance as to the status of their loved ones, they said.

Disconnected bridge structure seen from the roadside

Parts of the Francis Scott Key Bridge remain after a container ship collided with a support in the early hours of today.

The major bridge in Baltimore snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for multiple people in the water. (AP Photo/Steve Ruark)

Transportation Secretary Pete Buttigieg offers support following bridge collapse

Transportation Secretary Pete Buttigieg said he has offered his support to Maryland's governor and Baltimore's mayor, as rescue efforts remain ongoing.

'Please pray for those impacted': Baltimore County executive

Baltimore County Executive Johnny Olszewski, Jr. said on X that he was aware of the incident and rescue efforts were underway.

Dramatic moment of bridge collapse captured on video

The moment of the Key Bridge collapse was captured on a livestream early today, showing a container ship seemingly colliding with one of the bridge's support pylons.

Following the contact, the entire central span of the bridge can be seen collapsing into the water below, as well as onto the ship itself, within seconds.

Just moments before the collapse, vehicles could be seen atop the bridge.

It's not clear how many people or vehicles may have ended up in the water as a result of the collapse.

Map shows location of Francis Scott Key Bridge in Baltimore

Key Bridge in Baltimore collapses after large vessel collision

948-foot vessel collided with Key Bridge, U.S. Coast Guard says

The vessel that collided with the Key Bridge early today is a 948-foot vessel named the Dali, the U.S. Coast Guard has told NBC News.

The Coast Guard received a report at 1:27 a.m. ET that the vessel made impact with the bridge. It has deployed three response boats, and pollution responders are en route to the scene, according to Petty Officer First Class Matthew West.

The marine traffic tracker vesselfinder.com has the Singapore-flagged container ship currently located in Baltimore. It says it was headed for Colombo, Sri Lanka, and was expected to arrive there April 22.

Maryland Transportation Authority warns of 'active scene' as traffic rerouted from collapsed bridge

The Maryland Transportation Authority (MDTA) has warned drivers to avoid the I-695 southeast corridor after the Francis Scott Key Bridge collapse early this morning, calling it an "active scene."

The authority is advising drivers to use I-95 or I-895 instead.

It earlier said that all lanes were closed in both directions on the bridge, and traffic was being rerouted.

Photo shows collapsed bridge

The collapsed Francis Scott Key Bridge in Baltimore this morning.

Baltimore mayor en route to the scene of the bridge collapse

The mayor of Baltimore has said he is headed to the scene.

Major bridge in Maryland collapses after being hit by a ship

Patrick Smith

A major bridge in Baltimore partially collapsed this morning, possibly leaving a number of people in the river below, authorities said.

A spokesperson for Baltimore Police Department told NBC News that it had been notified of the incident at the Francis Scott Key Bridge, an enormous steel structure which carries Interstate 695 over the Patapsco River southeast of the Baltimore metropolitan area.

“I can confirm at 1:35 a.m., Baltimore City police were notified of a partial bridge collapse, with workers possibly in the water, at the Francis Scott Key Bridge,” Detective Niki Fennoy said in a statement.

Read full story here.

COMMENTS

Best depth sounder models from handheld to top of the range
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Installing a depth finder, also known as a depth sounder or fish finder, is a valuable addition to any sailboat. It provides crucial information about the water depth beneath the vessel, aiding navigation and ensuring safe passage. ... Through-hull installation requires drilling a hole through the boat's hull, while transom mount involves ...
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Sonar and sounders: 4 new models that are good for more than just fishing
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DepthTrax 2B
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A depth sounder is an instrument used to measure the depth of water, usually found on boats and other water vessels. It works by emitting sound waves from a transducer and measuring how long it takes for the waves to reach the bottom and reflect back. This time can then be used to calculate the depth of the water below.
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First and foremost, your depth sounder is a navigation tool, and it will ensure that you don't find yourself stranded in shallow waters. As the name suggests, depth sounders display the depth of water you're currently in, on the screen at the helm of your boat. Of course, it didn't take long for fisherman to work out that this is a ...
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What to know about the Baltimore Francis Scott Key Bridge collapse
Rebecca Tan. March 26 at 8:55 AM. The Francis Scott Key Bridge in Baltimore collapsed around 1:40 a.m. Eastern time Tuesday after being hit by a cargo ship, with large parts of the bridge falling ...
Francis Scott Key: Baltimore bridge collapses after container ship
2 people pulled from water after Baltimore's Key Bridge collapses, 1 in serious condition. Watch live views from Baltimore where a major bridge snapped and collapsed after a container ship rammed into it early Tuesday, and several vehicles fell into the river below. Rescuers were searching for at least seven people in the water.
Live Updates: 6 People Are Missing After Baltimore Bridge Collapse
A cargo ship struck a bridge that crosses outer Baltimore Harbor early Tuesday, triggering a collapse, the authorities said. The Coast Guard received a report of an impact at 1:27 a.m. Eastern ...
Baltimore Key Bridge collapse: Construction crew remains missing
BALTIMORE − The Francis Scott Key Bridge − a major span critical to East Coast shipping − collapsed early Tuesday after it was struck by a large cargo ship, prompting a massive emergency ...
Francis Scott Key Bridge collapse: Rescuers are searching for at least
A massive container ship lost power early Tuesday before crashing into the Francis Scott Key Bridge in Baltimore, causing it to collapse into the frigid Patapsco River along with people and ...
Francis Scott Key Bridge collapse live updates: Ship hits Baltimore
A major bridge in Baltimore, Maryland, partially collapsed early Tuesday, possibly leaving a number of people in the river below, authorities said. The Francis Scott Key Bridge, which carries the ...

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