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Deviation on the standby compass is..
  • A
    zero on the magnetic Equator.
  • B
    positive if the Compass North is to the west of Magnetic North.
  • C
    dependent on the heading of the aircraft.
  • D
    independent of the latitude of the aircraft’s position.
The amount of deviation depends on the aircraft heading and is induced by other magnetic materials, electrical currents, airframe, etc. During this procedure, the aircraft is turned through a series of headings and the readings from the aircraft’s compass are compared to an accurate reference compass which is independent of the aircraft’s compass. This procedure is called ‘compass swing’ and is carried out on a specially prepared surface of an airfield, known as the ‘compass base’ or a ‘compass calibrated pad’ where a compass rose is painted.

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