Cost of depth sounders vs fishfinders
My depth sounder is broken also. They always seem to be. But my fishfinder works great. The sensor is epoxied to the inside of the hull, not on the transom, and works great. Sound waves can''t tell the difference between a half inch of water and a half inch of fiberglass. The previous owner installed it just behind the keel, but it could have been mounted in front.... there was plenty of cable.