magnetic deviation - Compass error. The difference between the reading of a compass and the actual magnetic course or bearing due to errors in the compass reading.
Magnetic deviation. The difference between the reading of a compass and the actual magnetic course or bearing due to errors in the compass reading. These errors can be caused by metals, magnetic fields and electrical fields near the compass.
See magnetic deviation or compass error.
dew point
The point of temperature and air pressure at which water vapor forms mist or fog ...
Magnetic Bearing - The bearing of an object after magnetic variation has been considered, but without compensation for magnetic deviation.
The compass course has added the magnetic deviation and the magnetic variation to the true course. Compass rose A circle on a chart indicating the direction of geographic north and sometimes also magnetic north.
With the introduction of iron-clad ships the magnetic deviation observed in compasses became more severe. Methods of compensation by arranging iron or magnetic objects near the binnacle were developed.
Compass Course:
The direction of a ship's heading as read on a compass. The compass course has added the magnetic deviation and the magnetic variation to the true course.
 See also: Deviation, Compass, Light, Deck, Boat
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