I have a Comnav 1101 Autopilot system and a Garmin 700 series GPS/Chart Plotter. Both work great, My problem is the autopilot isn't reading the NEMA 0183 sentences from the GPS. I have called Garmin and COMNAV about this but no help. Has anyone had a similar problem? If so, how did you fix it? Or are the two not compatible.