grid heading[′grid ¦hed·iŋ]
In grid navigation, the heading relative to grid north.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An aircraft heading measured relative to grid north. See grid direction.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved