See Also: Magnetic Deviation - Sailing(gambling)
Deviation - Sailing(gambling)
Magnetic Course - Sailing(gambling)
Magnetic Variation - Sailing(gambling)
Magnetic North - Sailing(gambling)
Magnetic Bearing - Sailing(gambling)
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Magnetic Deviation - Sailing (gambling)


Compass error. The difference between the reading of a compass and the actual magnetic course or bearing due to errors in the compass reading. These errors can be caused by metals, magnetic fields and electrical fields near the compass. Prior to using a compass, magnetic deviation should be recorded for many different points on the compass as the error can be different at different points. The act of checking for magnetic deviation is called swinging.