I have the great solution, why you ask....because I have had the same problem. Hee hee # 1 if you have a manual mode use it. this allows you to preset your gain and signal levels. In auto...they are set to high. # 2 the instructions say to have the sonar about 1/8 below the hull of the boat..FORGET that. I have mine after many trial and errors, approx 3/4 - 1 inch. It is almost like haveing a through hull. WORKS AWESOME now. Even at high speeds. I still get a bit of garble now and then . But for the most part, I get great readings. my unit is a Furuno 582 = 600 watts of power
