Magnetic deviation
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This article is about compass error due to local magnetic fields. For variation of the Earth's magnetic field from true North, see Magnetic Declination.
Magnetic deviation is the error induced in a compass by local magnetic fields, which must be allowed for, along with magnetic declination, if accurate bearings are to be calculated. (More loosely, "magnetic deviation" is used by some to mean the same as "magnetic declination". This article is about the former meaning.)
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