I have two transducers on my boat. One is shoot through the hull, unknown brand, and ther other is standard mount from a lowrance x65. I am using a piranna 3 (humminbird) depth finder. I have tryed hooking up to both and adjusting acording to directions and I can not get good readings at higher that idle speeds. It will show 350 ft in 40 ft of water and then show 0 ft. Is it impossible to obtain good reading at high speeds, or is it a bad idea to use transducers that didn't come with the unit?
