I have the exact same issue, drives me nuts! I go to create a route on my graph, say follow it… It does great to the first dot and then just gets lost and wanders off.. I suspect it has something to do with the graph having a gps, my point 1 gps and the motorguide having one as well. I know there are settings within the graph on which one to use for what but for the life of me I can not figure it out.
Ohh, and also if I am using autopilot trolling at lets say 2 mph and want to jog the course a bit to the left, if I hit the left button the troller usually jogs far to the right and ticks me off. I now just manually troll to a set speed and drive it like a normal trolling motor.. Electronics man, they suck