Rudder reversed / heading inaccurate / pilot veers

[jeffk651]

I swapped the red and green wires, and that fixed the reversed rudder reading, and redid the dockside wizard. My offset is -3. Next sail probably won't be for a month or so, so we'll have to see how it does then. How is heading calculated. If I'm sitting at the dock, then should my heading and compass be the same? In the screen that shows the offset it said my magnetic reading is 149°, but then it says my heading is 162° even though I'm sitting still.