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grid variation

noun, Navigation.
the angle, at any point on the surface of the earth, between the magnetic and true meridians passing through that point.
Also called grivation. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for grid variation

grid variation

(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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