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Originally Posted by RPJ  What exactly is involved when an A&P says he will "swing the compass" to get rid of errors? |
A compass swing is a procedure used to compare the aircraft's compass to a known good standard, usually an airport compass rose or portable calibrated compass. The airplane is turned to several different headings, usually every 30 degrees or so, and the difference between what the aircraft's compass reads and the known good heading is noted. Once the errors are known, the compass can be corrected by adjusting small internal compensating magnets. It's usually not possible to compensate for all of the errors, so the rest are noted on the new compass correction card.
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Do you guys have any other suggestions?
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It's not a big deal at all. Just let them do their thing and go on about your way.