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grid convergence[′grid kən‚vər·jəns]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The horizontal angle at a place between true north and grid north. It is proportional to the longitude difference between the place and the central meridian. It is measured east or west from true north.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved