OMDG! What a PITA! I spent the day in a tiny space trying to hook up the gps/autopilot. I am hoping that someone has the same system and can help me with what I am doing wrong. I have the Simrad wp 32 and the Garmin 178c and they work fine seperately but not together. The Simard has a junction box that is color coded so I am comfortable there. The Garmin has many wires but the instructions state, red, black {power and ground} and a blue wire for the autopilot Nmea port.I have wired those three wires into the same junction box[per the instructions}. I have changed the format on the gps also to the nmea {or whatever it's called}. As the instruction goes, it should work. The problem is, the autopilot doesn't fallow the waypoints I put in. Also the Nav light on the autopilot doesn't light up as the directions state it will when active and in waypoint mode. I have called both places {Garmin and Simrad} and they both blame the other. I have also searched the archives and read many posts but none for for the equipment I am using. Any ideas? Anyone hook up the same stuff and remember something that wasn't clear in the instructions?.... as always, Thanks, Jack