I AM ON MY THIRD UNIT . THE ONE I JUST GIVE UP THE DEPTH DID NOT SHOW ON THE SCREEN . I HAVE ANOTHER UNIT AND IT JUST COMES UP SOMETIMES . SO NOW NEW TRANSDUCER ON THAT UNIT CAN'T TELL IF IT IS GOING TO WORK OR NOT TILL I GET A CHANCE TO GO. I HAVE NEW BATTERIES AND THE UNIT IS HOOKED TO IT'S OWN BATTERY . I DON'T KNOW WHAT TO DO . ANY IDEAS ? MOUNTED ON THE TROLLING MOTOR .