I've been an avid OCPN user for the past 3 years.
I occasionally would get the ship heading different from the COG. This pointed the ship icon in the wrong direction. Previously, doing an autopilot
heading calibration to my magnetic compass
direction would correct the problem. After much consternation, we installed and got gradar running. Took the boat out for the first time in 6 months to check the electronics
. The gradar works wonderfully. the only problem is that the HDG is different from the COG, pointing the boat in the wrong direction, incorrectly aligning the radar
image.... frustrating to watch. We have two GPSs, the ship's GPS
and another that is part of the AIS
transponder. I get less dancing around, of course when I turn off the AIS
, but the ship icon is still at an angle to COG. In our testing we were mostly traveling under 4 knots, but this hasn't been a problem previously......
Thanks in advance,