Thanks for the thread kingfisher2. I have the same motor 15 hp Merc without EFI. After half a dozen emails navy and forth with Garmin they are no help at all. “Since your motor is not listed as a a compatible unit we will not guarantee it”.I have been screwing with EZ steer for years that doesn’t work, can’t find a good autopilot system. I think sell the EZ steer and the 15hp Merc and use the autopilot on the main and bags. Sent from my iPhone using Lake Ontario United