Aircraft Magnetism | Deviation

The compass needle would accurately define the magnetic meridian were it not for the aircraft’s own internal magnetism deflecting it. Deviation is the angular difference measured between the direction taken up by a compass needle and the magnetic meridian. Deviation is named easterly or westerly depending on whether the north-seeking end of the compass needle lies to the east or west of the magnetic meridian.

Compass Heading Deviation Magnetic Heading
Deviation West
Compass Best
095 -5 090
Deviation East
Compass Least
090 +5 095



Behnam Bidar

Commercial Pilot Of I.R.I And The Civil Aviation Training Group Supervisor

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Aircraft Magnetism | Deviation

by Behnam Bidar time to read: <1 min