Magnetic Compass Deviation.
The Magnetic Compass Deviation is the angular deviation of a compass card, to right or left of the magnetic meridian, determined by the influence of magnetism of the ship or cargo;
Is dihedral angle formed between the magnetic meridian plane and compass meridian plane;
It is variable from ship to ship and is depending on the magnetic course of the vessel.
The variation curve of a vessel’s magnetic compass is determined when adjust the magnetic compass.
This deviation will be verified time to time by various methods.
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