compensating magnets

Typical arrangements of compensating magnets.

Two or more magnets on a magnetic compass to correct or minimize deviation.

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Compensating magnets also are installed in the compass.

The magnetic compass: the simplest instrument in the panel also has simple requirements, but it can be the most difficult to use

What you adjust are the compensating magnets in the compass that are designed to compensate for electrical and magnetic influences of the aircraft.

There are two screws on the face of the instrument (sometimes covered by a removable plate), which move the compensating magnets. The two screws are labeled N/S and E/W.

Mag compass upkeep: more than fluid fills: you might save money by helping with time-consuming calibrations, but a new replacement makes better sense than attempting major bench repairs