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. 2014.
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World English Dictionary
grid variation
nautical Also called: grivation the angle between grid north and magnetic north at a point on a map or chart

Collins English Dictionary - Complete & Unabridged 10th Edition
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