Just got my retirement boat. Lund 1600 Fury Tiller. Thinking about putting a Terrova 55 with US2 and I-Pilot. Now I know that SI and DI won't work on the US2, so wondering what locator would be best for me. I'm looking at the Hummingbird 859ci HD. I do a lot of trolling with the trolling motor for walleye and like the idea of being able to mark my spots with the I-pilot. Anyone have any advice on locator or trolling motor match up? Good or bad? I'm 66 and don't keep up on all the electronic changes.