Several years ago I fitted a small digital depthsounder to my Caribe 9' RIB. It has a thru-hull transducer and is powered by a small AGM
battery located in the little bow locker, and kept charged with a small solar
The depthsounder works well, but two cautions:
1. the Caribe has a double fiberglass hull
; I didn't know that at the time, so you can imagine the leak problem into the lower space between the hulls; and
2. the little depth sounders do not hold up well to sunlight. I had to replace one a couple of years ago.
Also, be sure not to let your dingy fill with water
and submerge the depthfinder unit itself. Ask me how I know :-)