grid direction[′grid di¦rek·shən]
Horizontal direction expressed as angular distance from grid north, measured from grid north, clockwise through 360°.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Headings in relation to the grid north.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved