Thanks Ken,
You are correct. The HDS is telling me “Heading Not Connected To Radar”. Can you tell me where the connection could be? I believe my Garmin GHP 10 autopilot sends data over a NMEA 0183 connection because of some non-compatibility issues between Lowrance and Garmin NMEA 2000 at the time the gentlemen at “Y” Marina installed it. (I know , GARMIN is a dirty word) 