
Transducers are devices that can be used to detect fish, bottom structures, and the topography of the sea or riverbed. They can also record the depth and temperature of the water, the speed of the boat, and aid in navigation by rendering images of what's below the boat. There are several types of transducers, including transom mount, in-hull, and through hull. Transom mount transducers are installed on the transom of the boat, hanging into the water and usually protruding just below the level of the hull. In-hull transducers are mounted internally inside the hull, and through hull transducers are installed nearly flush to the hull to minimize drag and improve performance at higher speeds.
| Characteristics | Values |
|---|---|
| Type | Transom transducers, in-hull transducers, through-hull transducers |
| Mounting | Mounted on the transom of the boat, hanging into the water and protruding just below the level of the hull |
| Installation | Easy to install, ideal for boats being trailered |
| Performance | Suffers from drag, does not always operate well at high speeds |
| Hull material | Works with any hull material |
| Maintenance | Easy to remove without taking the boat out of the water |
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What You'll Learn
- Transom transducers are mounted onto the transom of the boat, usually sitting lower than the bottom of the hull
- In-hull transducers are mounted internally inside the hull
- Through-hull transducers are for boats with inboard propulsion and high-speed boats
- Transducers can be used to detect fish, bottom structures, and the sea/riverbed topography
- Transducers can record the depth and temperature of the water, and the speed of the boat

Transom transducers are mounted onto the transom of the boat, usually sitting lower than the bottom of the hull
Transom transducers are a good option for smaller boats with outboard or sterndrive motors. They can simply be hung off the transom of the boat. This is a great location for smaller vessels, as well as boats that are trailered regularly.
Transom transducers are also a good choice for boats with inboard propulsion and high-speed boats. They can be installed nearly flush to the hull to minimise drag and ensure great performance at higher speeds. Internally tilted or offset elements compensate automatically for the deadrise angle of the boat's bottom, ensuring the transducer's beams are optimally positioned.
In-hull transducers are another option, where the transducer is mounted internally inside the hull. The benefit of this type of installation is that there is nothing hanging externally on the boat, which improves drag and means there is no risk of accidentally hitting the transducer. In-hull transducers are also easy to remove for maintenance without having to take the boat out of the water. However, they only work with certain hull types, typically on boats with a fibreglass bottom, and will not work with metal or wooden hulls.
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In-hull transducers are mounted internally inside the hull
In-hull transducers are a good option for boats with inboard propulsion and high-speed boats. They can be installed nearly flush to the hull to minimise drag and ensure great performance at higher speeds. Internally tilted or offset elements compensate automatically for the deadrise angle of the boat’s bottom, making sure your transducer’s beams are optimally positioned.
Other types of transducers include transom transducers, which are the most popular type of external transducer. These are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. They are ideal for smaller vessels and boats that are trailered regularly. When mounted on a single engine, they should be on the starboard side of the transom to avoid prop wash. Twin engines should be mounted low and between the two engines.
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Through-hull transducers are for boats with inboard propulsion and high-speed boats
Transducers are used to detect fish, bottom structures and the sea/riverbed topography. They can record the depth and temperature of the water, the speed of the boat and can generally aid in navigation by rendering images of what's below the boat.
Transducers can be mounted in different ways, depending on the type of boat and its propulsion system. Transom transducers are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. They are the most popular type of external transducer due to their ease of installation and are ideal for boats being trailered. However, they can suffer from drag and do not always operate well at high speeds.
In-hull transducers are mounted internally on the boat inside the hull. The major benefit of this type of installation is that there is nothing hanging externally on the boat, which improves drag and means there is no concern about hitting the transducer on anything by accident. However, they only work with certain hull types, typically on boats with a fibreglass bottom.
Through-hull transducers are ideal for boats with inboard propulsion and high-speed boats. Modern through-hull transducers can be installed nearly flush to the hull to minimise drag and ensure great performance at higher speeds. Internally tilted or offset elements compensate automatically for the deadrise angle of the boat’s bottom, making sure your transducer’s beams are optimally positioned.
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Transducers can be used to detect fish, bottom structures, and the sea/riverbed topography
Transducers are available in transom mount, in-hull, or through hull, and tilted element configurations. They come in plastic composite, bronze, or stainless steel to fit practically any boat on the water.
Transom transducers are mounted onto the transom of the boat and usually sit lower than the bottom of the hull. They are the most popular type of external transducer due to their ease of installation, and 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 for a single engine to avoid prop wash. Twin engines should be mounted low and between the two engines.
In-hull transducers are mounted internally on the boat inside the hull. The major benefit of this type of installation is there is nothing hanging externally on the boat, which not only improves drag but there is also no concern about hitting the transducer on anything by accident. The biggest one is that these only work with certain hull types, typically on boats with a fibreglass bottom. They will not work with metal or wooden hulls.
Boats with inboard propulsion and high-speed boats will likely want to consider through-hull transducers for even better performance. Modern through-hull transducers can be installed nearly flush to the hull to minimise drag and ensure great performance at higher speeds. Internally tilted or offset elements compensate automatically for the deadrise angle of the boat’s bottom, making sure your transducer’s beams are optimally positioned.
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Transducers can record the depth and temperature of the water, and the speed of the boat
Transducers are available in transom mount, in-hull, or through hull, and tilted element configurations. They can be made of plastic composite, bronze, or stainless steel. 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. Twin engines should be mounted low and between the two engines.
In-hull transducers are mounted internally on the boat inside the hull. This type of transducer works best with boats with a fibreglass bottom, but not with metal or wooden hulls. The major benefit of this type of installation is there is nothing hanging externally on the boat, which not only improves drag but also means there is no concern about hitting the transducer on anything by accident.
Through-hull transducers are best for boats with inboard propulsion and high-speed boats. They can be installed nearly flush to the hull to minimise drag and ensure great performance at higher speeds.
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Frequently asked questions
A transducer is a device that can be used to detect fish, bottom structures and the sea/riverbed topography. They can record the depth and temperature of the water, the speed of the boat and can generally aid in navigation by rendering images of what's below the boat.
Transducers are available in transom mount, in-hull, or through hull, and tilted element configurations. They are usually mounted on the transom of the boat, hanging into the water and protruding just below the level of the bottom of the hull.
Transom mount transducers are the most popular type of external transducer due to their ease of installation. They are ideal for boats being trailered when installed with a kick-up bracket, to ensure the transducer doesn’t hit anything.
In-hull transducers are mounted internally on the boat inside the hull. The major benefit of this type of installation is there is nothing hanging externally on the boat, which not only improves drag but also means there is no concern about hitting the transducer on anything by accident.








































