The difference of about 9° for the gyro compass is the deviation of the magnetic north to the geografic north.
The map is oriented to the geografic north, not the magnetic.
Additional is near the magnetic compass, good visible but not legible in the 109, the deviaton table for that plane, informing about the deviation between the indicated value and the real value for the magnetic compass.
Though the latter is not used ingame afaik.
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