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84. What is the term used for the horizontal angle between the magnetic meridian and the north-south line axis line of the magnetic compass?
Deviation is the horizontal angle between the magnetic meridian and the magnetic compass's north-south line, caused by the vessel's magnetism. Variation is the angle between true north and magnetic north. Compass error is the sum of variation and deviation. Dip is the vertical angle of the Earth's magnetic field.
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