omnibearing indicator

omnibearing indicator

[′äm·nə‚ber·iŋ ′in·də‚kād·ər]
(engineering)
An instrument providing automatic and continuous indication of omnibearing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

omnibearing indicator (OBI)

omnibearing indicator (OBI)click for a larger image
An indicator that gives bearing information by a pointer rotating over a fixed compass card or a rotating card against a fixed datum. VOR (very high frequency omnidirectional radio-range) bearings are magnetic bearings on an OBI, whereas the radio compass bearings appear as a relative bearing. Note: In the Northern Domestic Airspace in Canada and at high latitudes in other countries, VOR stations are oriented to true north rather than magnetic north.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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