Well, this post will probably be of little help. Many years ago I had problems with interference from the trolling motor. I was running the MinnKota Maxxum that incorporated the battery saver and infinite speed control technology. I did all kinds of stuff and was able to minimize but not eliminate it. When I saw that running it at max speed did not cause interference I concluded the problem was the battery saver and infinite speed stuff. I bought a MinnKota Edge 70 that has neither technology. Right now I have 2 Vexilar xd's, GT50, GT8, PS21 and PS31 all mounted on the trolling motor and all the cables wind around the trolling motor harness and down the shaft. No interference. I wear out a trolling motor every 3 years and this is my third Edge 70. I have a spare in the garage right now ready to go when this one quits. It's just a choice I made as to the features the more advanced ones offer or getting rid of interference once and for all. Maybe not for everybody.

I do see where people are able to resolve this issue. But I still see others with Humminbird units and MinnKota motors that never resolve it. Johnson Outdoors owns both and can't completely resolve this? Imagine how many tech support calls they get for interference. I'll stick with the Edge 70 until someone offers a newer, better one that they flatly state up front will not cause sonar interference.

Off the subject: I sure wish someone would make a scissors mount with user replaceable parts kit for when these mounts wear out and get loose, sloppy and noisy. The mount always wears out before the motor.