My trolling motor appears to be on its last leg. (Well not completely, it's just the foot pedal and I'm hopeful I can get a purchase authorization from the wife for a new setup.)

I have a Ranger Reata fish/ski with some old electronics. What would be the minimum (price) equipment combo necessary to follow contours, spot lock, travel straight lines @ constant speed, etc? It would be excellent if trolling motor could be removed for family ski trips.

Thanks!