Deviation
Deviation is the angle between the magnetic north and true north at a particular location. It is caused by the magnetic properties of the earth and the position of the compass relative to the magnetic north. Deviation can be determined by comparing the readings of a compass with the known magnetic heading of a vessel. Deviation is important for navigation as it affects the accuracy of compass readings and can lead to errors in course plotting and steering. It is necessary to correct for deviation by applying appropriate corrections to the compass readings.
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