Magnetic deviation is the compass error caused by local magnetic fields generated by nearby ferrous materials or electrical equipment, which distort the Earth's magnetic field in the vicinity of the compass. It is a local effect: the amount and direction of deviation depend on the specific location of the compass within a vessel, aircraft, or vehicle, and can vary even within the same craft.
Magnetic deviation is the compass error caused by local magnetic fields generated by nearby ferrous materials or electrical equipment, which distort the Earth's magnetic field in the vicinity of the compass. It is a local effect: the amount and direction of deviation depend on the specific location of the compass within a vessel, aircraft, or vehicle, and can vary even within the same craft.
Source: Wikipedia "Magnetic deviation" · CC BY-SA 4.0
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