Autopilot turning too early for track course

[stevemitchell]

Thanks very much for your quick and, as always, detailed answer Chuck!

I originally had STW instead of SOG set in the autopilot and had read something on the forums or elsewhere (posted by someone else, not yourself) that SOG was a better value even for a sailboat. I'm glad to hear that STW is the correct value, as SOG never made sense to me.

I have seen a discrepancy in my STW vs SOG in a slack condition, and the boat is being hauled in a few days for bottom cleaning and paint, so I will check for growth and also re-run a calibration on both the autopilot and STW instrument to make sure there are no issues there.

I will also look into the arrival alarms and see if that is my issue as well.