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Boat transducers are devices that are mounted onto the transom of a boat, usually sitting lower than the bottom of the hull. They are used to help with navigation and are compatible with a variety of hull types, including fibreglass, metal and wooden hulls. Transom transducers are the most popular type of external transducer due to their ease of installation and compatibility with boats being trailered. They can also be mounted internally on the boat inside the hull.
| Characteristics | Values |
|---|---|
| Type | Transom transducers, in-hull transducers, thru-hull transducers |
| Installation | Transom transducers are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. In-hull transducers are mounted internally on the boat inside the hull. Thru-hull transducers are most commonly used on larger yachts and launches. |
| Compatibility | Transom transducers are the most popular type of external transducer due to their ease of installation and compatibility with all types of vessels and hull materials. In-hull transducers work with hull deadrise angles up to 25 degrees. Thru-hull transducers only work with certain hull types, typically on boats with a fibreglass bottom, and will not work with metal or wooden hulls. |
| Performance | Transom transducers can suffer from drag and may not operate well at high speeds. In-hull transducers, when used with high-performance fairings, give very precise high-speed results. Thru-hull transducers generally give a better sonar image. |
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What You'll Learn
- Transom transducers are mounted onto the transom of the boat and are the most popular type of external transducer
- In-hull transducers are mounted internally on the boat inside the hull
- Through-hull fitting is most commonly used on larger yachts and launches and generally gives a better sonar image
- Shoot-through hull fitting is for boats with solid fibreglass or metal hulls
- Fairing blocks can be used to compensate for any deadrise angles over 5 degrees
Transom transducers are mounted onto the transom of the boat and are the most popular type of external transducer
Transom transducers are often bundled with fish finders and typically come with a fixed 90-degree bracket, either stainless steel or plastic. They can also have a swing-away bracket that allows the transducer to flick up without damage if it strikes an object.
Transom transducers are versatile and can be used on all types of vessels, with a variety of different hull materials. When combined with high-performance fairings, they provide precise high-speed results and can work with hull deadrise angles up to 25 degrees. Fairing blocks can be used to compensate for deadrise angles over 5 degrees, improving the smooth flow over the face of the transducer and reducing drag.
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In-hull transducers are mounted internally on the boat inside the hull
In-hull transducers rely on sound pulses passing unimpeded through the hull structure. To ensure the sound pulses pass through the hull effectively, the transducer base and top are shaped to adjust for hull angle. The hull angle can also be compensated for using fairing blocks, which are cut to match the deadrise of the hull at the mounting location. Fairing blocks help to reduce the drag of the transducer by improving the smooth flow over the face.
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Through-hull fitting is most commonly used on larger yachts and launches and generally gives a better sonar image
Through-hull fitting is most commonly used on larger yachts and launches. This is because it generally gives a better sonar image. The transducer is mounted inside the hull and relies on sound pulses passing through the hull structure. This means that it is best suited to boats with solid fibreglass or metal hulls.
Through-hull transducers are also less likely to be damaged when pulling the boat out of the water, as they do not have a trailer. They are usually larger than other types of transducers, such as transom transducers, due to the expected signal loss through the hull. They also have to sit within a tank that should be filled with non-toxic marine/RV anti-freeze.
Transom transducers are the most popular type of external transducer, as they are easy to install. They are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. They work with any hull material, but they can suffer from drag and do not always operate well at high speeds.
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Shoot-through hull fitting is for boats with solid fibreglass or metal hulls
Transom transducers are the most popular type of external transducer. They are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. They are ideal for boats being trailered when installed with a kick-up bracket, to ensure the transducer doesn't hit anything. When they are mounted on a single engine, they should be on the starboard side of the transom to avoid prop wash.
In-hull transducers are mounted internally on the boat inside the hull. They can be used on all types of vessels, with a variety of different material hulls. When used in combination with high-performance fairings, they give very precise high-speed results and can work with hull deadrise angles up to 25 degrees. Fairing blocks can be used to compensate for any deadrise angles over 5 degrees, and they are cut to match the deadrise of the hull at the mounting location.
Through-hull fitting is most commonly used on larger yachts and launches and generally gives a better sonar image. Without a trailer, there is no risk of damaging the transducer when pulling the boat out of the water.
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Fairing blocks can be used to compensate for any deadrise angles over 5 degrees
Transducers can be used on all types of vessels, with a variety of different hull materials. When used with high-performance fairings, they can provide very precise high-speed results and can work with hull deadrise angles of up to 25 degrees.
Fairing blocks can protrude below the hull or lie completely flush with the outside surface of the hull. They are used to improve the performance of transducers, which are mounted internally on the boat inside the hull.
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Frequently asked questions
A boat transducer is a device that is mounted onto the transom of the boat and usually sits lower than the bottom of the hull.
Boat transducers work by sending out sound pulses that pass through the hull structure and reflect off objects in the water. The transducer then receives the echoes of these sound pulses, which are used to create a sonar image that can be displayed on a screen.
Boat transducers can work with a variety of different material hulls, including fibreglass, metal, and wooden hulls. However, some transducers only work with certain hull types, such as boats with a fibreglass bottom.
Boat transducers can be mounted externally on the transom of the boat or internally inside the hull. The most common type of mounting is the transom mount, which is typically a fixed 90-degree bracket made of stainless steel or plastic.
In-hull transducers are mounted inside the hull of the boat, while through-hull transducers are mounted on the outside of the hull. Through-hull transducers are more commonly used on larger yachts and launches and generally provide a better sonar image.
