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i. Frangible markers placed on the sides of runway indicating the remaining runway length available in thousands of feet. These have black background with numerals painted in fluorescent orange/red color.
ii. A reference marker indicating distance, particularly on a radar indicator to indicate distance of a target from the radar antenna. On a PPI (plan position indicator), it is usually one of a series of concentric circles. Also called range markers.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved