The one "autopilot" circuit activates all my SeaTalk stuff and autopilot stuff. That includes wind speed/direction, boat speed, depth, tridata display in our cabin, fluxgate compass also in cabin, autpilot computer, rudder position sensor, linear drive, autopilot control head and probably more. Hmmm... I have a SeaTalk to NMEA converter box tucked back there somewhere. I'll have to see if that has anything to do with it. I'm a little uneasy about randomly unplugging stuff.