This is the difference between Magnetic North and the actual direction the compass is pointing to. A difference exists because of interference around the compass which can alter the direction the arrow points to slightly and a correction is noted on a Deviation Card.
This is the difference between Magnetic North and the actual direction the compass is pointing to. A difference exists because of interference around the compass which can alter the direction the arrow points to slightly and a correction is noted on a Deviation Card.
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