2020-04-30, 02:36 PM
As I'm sure you know, your position and heading with GPS varies continuously when you are sitting still. I've been troubleshooting another GPS-related problem while sitting at home, and turned tracking on OpenCPN, the track is all over the place, within less than .01 Nm. It's just position drift from your GPS. GPS can't do course without movement - it uses the last two position reports to estimate course. Speed is estimated using either differential between position reports or Doppler shift. So yes, it will sort itself out when you get on the water.