local-area underwater navigation system
local-area underwater navigation system[′lō·kəl ¦er·ē·ə ¦ən·dər¦wȯd·ər ‚nav·ə′gā·shən ‚sis·təm]
A system applied chiefly in the inspection and maintenance of offshore structures, in which time differences between the reception of acoustic signals from a chain of transmitters are used to determine the positions of divers and of crewed and uncrewed underwater vehicles. Abbreviated LAUNS.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.