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grid variation

American

noun

Navigation.

the angle, at any point on the surface of the earth, between the magnetic and true meridians passing through that point.

grid variation British

noun

Also called: grivation. nautical the angle between grid north and magnetic north at a point on a map or chart

"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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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023