yep, Ivan is right, when calibrating your gyro compass, you have to add around 10(.5, roundabout) deg. to your magnetic compass bearing. This was not yet implemented at CoD launch, but was fixed in a patch and mentioned in luthier's patchnotes.
Try that, you should achieve better results then.
P.S.: The explanation for this is that the headings on maps are 'calibrated' with respect to the earth's true north/south poles, i.e. the geographic poles, around which the earth rotates. The magnetic compass obivously measures geomagnetic north, wich is off by the mentioned value in the UK/France area.
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