magnetic variation - The difference between magnetic north and true north, measured as an angle. Magnetic variation is different in different locations, so the nearest compass rose to each location on a chart must be used.
Magnetic Variation - Difference between true compass (TC) and magnetic compass (MC)
Make Fast - Securing a boat at a dock or landing. You don’t tie up a boat ...
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.
Magnetic Bearing - The bearing of an object after magnetic variation has been considered, but without compensation for magnetic deviation.
Magnetic variation: The variant angle of the difference between magnetic and geographic North Pole. The variation results from the movement of the magnetic North Pole.
World Magnetic Model (WMM) - The WMM provides an estimated magnetic variation for any position on Earth. The WMM is a product of the United States National Geospatial-Intelligence Agency (NGA). The U.S.
The amount by which magnetic variation changes up or down each year in a particular area. The annual increase or decrease is printed in the compass roses on each chart and may make a significant difference over a number of years.
A line connecting points of equal magnetic variation on a map.
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agonic line - An imaginary line (on the earth's surface) along which there is no magnetic variation.
aground - When the boat's keel or bottom is resting on the sea bottom.
ahead - In a forward direction; in advance of.
The course of a boat after being corrected for magnetic deviation and magnetic variation.
true north
Geographic north. Toward the North Pole.
 See also: Variation, Boat, Line, Point, Wind
  
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