My heading is not aligning with the top of my plotter screen. It is about 15 degrees off but that is not consistent and seems to be direction dependent. This is a new problem,and coincidentally or otherwise occurred just after upgrading to v7. Can anyone help with some quick setting checks I might do to troubleshoot this. The boat has TZT2BB, plus TZT2 MFT on flybridge. PGN500 heading sensors, Autopilot 500 series. I am not sure how all this equipment is connected together however when the AP is shut down the displays show lost heading sensor. I checked the Bearing setting in "units" and it was at magnetic. Changed to True but didn't solve the problem. Any help is appreciated as we are out cruising for next few weeks and this misalignment is awkward to adjust for.