to-from indicator[′tü ′frəm ‚in·də‚kād·ər]
An indicator that shows whether an aircraft is flying toward or away from an omnirange station. Also known as sense indicator.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
An indicator used in aerial navigation with the VOR (very high frequency omnidirectional radio-range) system. The To-From indicator shows the pilot if the aircraft is flying toward or away from the station it is flying at in the heading shown on the omnibearing selector. When the aircraft passes over the station, the To-From needle changes from “To” to “From.”
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved