Quote Originally Posted by deep-v
What setting do you guys run your sensitivity at? I put a fishmark 480 on the bow of my boat and put the hockey puck transducer on my trolling motor, and when the trolling motor is running I lose the screen and the depth display starts flashing all kinds of erroneous depths. I also run a fishmark 480 on the back of the boat as well. Could they be interfering with each other? Any suggestions?
Are you powering your 480 on the bow from the TM battery? If so, then that is the problem.