Theoretically, there are so many advantages to mounting a depth sounder transducer inside a hull that one wonders why all transducers are not mounted this way. For example, the inside-hull mount avoids the need to cut a hole in the bottom of the boat, and because nothing is hanging down from the transom, there is no drag or resistance in the water. But, there is a problem with the inside-hull mount. It will not work on some boats. To work satisfactorily, the inside-hull mount requires a boat that has a single-layer fiberglass or aluminum bottom. Few bigger boats have this. Double layers of fiberglass, foam cores, wood cores, or hollow cores in the bottom construction of a boat prevents the transducer’s sound waves from penetrating and returning to the transducer properly. A wood bottom also is unsuitable for this type of mount. There is, however, an easy way that you can check to see if your depth sounder will work and if it will, here are the instructions to mount it.
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