Thanks Ranger. I bought a Mark 4 and put it on the bow. Put the transducer on the trolling motor. But.... when the trolling motor is on, I must be getting some electrical interference because my screen turns almost all white (can barely see the transducer return through the white / milky screen). When the trolling motor is off, perfect picture, turn on the trolling motor, milky white again.
Any idea how to fix it?