In Hull (shoot Through)

An In-Hull transducer is mounted on the inside of the hull. The transducer signal "shoots through" the fibreglass and so the hull does not require a hole cut in it, although certain hull types may need to be bored out to remove any flotation material. When properly installed the effects od turbulance and aerated water are minimised. Because the transducer face does not touch the water, there is no real maintenance involved with an in-hull transducer.

In-Hull transducers will experience signal loss when shooting through hull material. This means that the performance of your fish finder will suffer. Most modern In-Hull transducers are designed to compensate for signal loss.

Boats with wood, aluminium or steel hulls will not be able to use In-Hull transducers as these materials acts as a very effective barrier against acoustic signals. Sound waves simply will not propogate through these materials. Only fibreglass boats, with no floatation core can utilise an In-Hull transducer. Fibreglass boats with foam balsa cores or those with airpockets will need to be "dug out" so that the face of the transducer touches the fibreglass hulls that is in contact with the water.