left-right needle

left-right needle

left-right needle
A needle in a navigational instrument, such as in a CDI (course deviation indicator), which gives steering directions to the pilot. The pilot tries to keep the needle in the center, or vertical. See also course deviation indicator.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Since we assume here that you have a separate GPS, you could fly the GPS left-right needle on its screen while the HSI tracks the localizer.
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