quadrantal error

quadrantal error

[kwä′drant·əl ‚er·ər]
(navigation)
The angular error in a measured bearing that is due to the presence of metal in the vicinity of the direction-finding antenna, such as the metal structure and engines of an airplane or the hull of a ship.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

quadrantal error

quadrantal errorclick for a larger image
The angular error in a measured bearing caused by the presence of metal in the vicinity of the direction-finding antenna, such as the metal structure and the engines of an airplane. This error is usually at its maximum on the quadrantal headings (045°, 135°, 225°, and 315° from the nose of the aircraft).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved