Redroach, can you confirm this please:
'...when calibrating your gyro compass, you have to add around 10(.5, roundabout) deg. to your magnetic compass bearing...'
I thought the procedure was to add/subtract variation to the TRUE bearing to get the Magnetic reading, and then add aircraft deviation to MAG bearing to get the correct gyro compass bearing. I assume deviation isn't modelled. So in this case we should add 10 deg to TRUE not to Magnetic reading. I'm no expert, please correct me if I'm wrong. Regards....
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