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grid variation

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noun Navigation.
the angle, at any point on the surface of the earth, between the magnetic and true meridians passing through that point.
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Also called grivation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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British Dictionary definitions for grid variation

grid variation

noun
nautical the angle between grid north and magnetic north at a point on a map or chartAlso 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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