shoran

[shawr-an, shohr-]
noun
a system for aircraft navigation in which two signals sent from an aircraft are received and answered by two fixed transponders, the round-trip times of the signals enabling the navigator to determine the aircraft's position.

Origin:
1930–35; sho(rt) ra(nge) n(avigation)

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Collins
World English Dictionary
shoran (ˈʃɔːræn)
 
n
a short-range radar system by which an aircraft, ship, etc, can accurately determine its position by the time taken for a signal to be sent to two radar beacons at known locations and be returned
 
[C20: sho(rt) ra(nge) n(avigation)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Abbreviations & Acronyms
shoran
short-range navigation
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Shoran required trained electronic technicians to keep the equipment in proper adjustment and calibration.
Shoran control was used where possible for ship and launch hydrography.
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