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grid variation

noun, Navigation
1.
the angle, at any point on the surface of the earth, between the magnetic and true meridians passing through that point.
Also called grivation.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for grid-variation

grid variation

noun
1.
(nautical) the angle between grid north and magnetic north at a point on a map or chart Also called grivation
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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