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range marker[′rānj ‚mär·kər]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
i. A single calibration blip fed onto the time base of a radial display. The rotation of the time base shows the single blips as a circle on the plan position indicator scope. The range marker can be used to measure range. See plan position indicator.
ii. Concentric circles, parallel lines, or other fixed graticules on a display in a HUD (head-up display), a HDD (head-down display), gun sights, or other displays that indicate range.
iii. A visual discontinuity in the time base on a display of a radar display by which the range can be measured.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved