Humminbird Smartcast Rf 35 Dual Display Wrist Sonar "sonar 7" Questions

my 570 transducer is mounted on trolling motor. my 570 transducer is mounted on trolling motor. the depth reading jumps from .6 to 7 feet and then stays at .6 feet I too have the exact same problem. ...

I have a humminbird fish finder 150 and broke the plastic peice that sits in the water is accidently got crushed on the trailer, do you know if I can buy another one in New Zealand (Dunedin)? Please ...