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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.


grid variation

noun

  1. nautical the angle between grid north and magnetic north at a point on a map or chart Also calledgrivation
“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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