cone of ambiguity

cone of ambiguity

[′kōn əv ‚am·bə′gyü·ə·dē]
(navigation)
The conical volume of airspace above the beacon in which bearing information is unreliable in VOR and Tacan.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.