What it means is that there is a difference between straight "up" on the map, and 000 on your compass. I don't have a link but it was in the change logs for one of the patches and was stated to be 10 degrees westerly.
Since bearings go from 0 to 359, you can just subtract 10 from your heading and always arrive at the right answer.
Compass says 180? You're actually flying 170.
Need to fly 040? Fly 050 on your compass.
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