horizontal obstacle sonar

horizontal obstacle sonar

[‚här·ə′zänt·əl ¦äb·stə·kəl ′sō‚när]
(navigation)
A constant-transmission, frequency-modulated sonar used in underwater navigation to detect objects ahead of a submersible vehicle and to determine the bearing and range of specially designed transponders. Abbreviated HOS.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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