To find your magnetic course (in no wind, the heading you see on your compass), you'll either subtract easterly variation or add westerly variation. Isogonic lines are drawn on your sectional charts to show different lines of magnetic variation to help with planning your magnetic heading. Variation is the difference between true north and magnetic north. The magnets in your headset speakers will almost certainly change the magnetic field enough to show a difference in heading. Next time you're in the cockpit, try putting your headset on the dash near the compass and see if it changes the compass heading. A compass card is normally attached, showing what error correction to add for different headings, although the changes are normally just a few degrees. Inside the compass, there are compensating magnets to counteract these fields of interference. Instruments in your airplane cause interference that affects your compass, and that interference is called deviation.
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