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Related to grid variation: agonic line
grid variation[′grid ‚ver·ē¦ā·shən]
In grid navigation, the angular difference between grid north and magnetic north.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The angular difference between grid north and magnetic north. It is measured east or west from grid north and is also called a grivation or grid magnetic angle.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved