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Check out the link below to know about SONAR
http://en.wikipedia.org/wiki/sonar...
Sound Navigation And Ranging
There are other meanings too. Check out http://www.acronymfinder.com for all of them.
SONAR (SOund Navigation And Ranging) — or sonar — is a technique that uses sound propagation under water (primarily) to navigate, communicate or to detect other vessels. There are two kinds of sonar — active and passive. Sonar may be used as a means of acoustic location.
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