Transom-mount transducers are also less expensive than comparable thru-hull models. For example, Hodges Marine retails the Airmar TM185HW (high-frequency chirp, wide beam) for a Furuno echo sounder ...

It don’t mean a thing if ain’t got that ping. With apologies to the first lady of song, the late great Ella Fitzgerald, that sums up fish-finder performance. The world’s finest sonar is useless ...