Originally Posted by
Snubbys
Yep these guys are right, if mounting on the trolling motor then you will need to exchange it. I have the helix 9 si GPS and didn't do any reading on it (wasn't aware of exchange option). Mounted the transducer on my tm and get some interference when tm is running. Works fine if I'm drifting and keep my foot on the pedal to keep tm head straight. So I either have to get right transducer for tm or mount the transducer I have on the transom of the boat. I'm going to mount on the transom this afternoon I do believe.