position line

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position line

[pə′zish·ən ‚līn]
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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

position line

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A line indicating a series of positions at which the observer is estimated to be at the time of observation. These can be straight, curved, hemispherical, or irregular lines, depending on the information they convey. Circular position lines indicate range (e.g., visual range, radar range, hyperbolic position lines), whereas straight lines represent an angular relationship between an aircraft and a known position or orientation of a tall ground or high feature.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved