The angle between compass north and magnetic north is called...
Refer to figure.
Magnetic Direction, have as reference the Magnetic North Pole and is assigned an angular value of 000° M or 360° M.
The utility of a magnetic compass on the aircraft will depend on the accuracy of its response to the magnetic field of the earth. The metallic structure of the airplane, its engine and equipment can affect the accuracy of the compass, an effect called the compass deviation.
Compass deviation is defined by the number of degrees by which unwanted magnetic fields deflect the compass from the magnetic north indication.
Deviation (-) West – Compass Best
Deviation (+) East – Compass Least
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