rule of sixty
rule of sixty[′rül əv ′siks·tē]
An air navigation rule of thumb which states that for each mile off course in a 60-mile leg, the correction to parallel the original course is 1°.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved