sonar
Noun
Meaning
a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
Source: WordNetSynonyms
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Examples
So, great. This is Camp...what do you call it? Camp Fish-Blood?” Aphros frowned. "I hope that was a joke. This is Camp __________.” He made a sound that was a series of sonar pings and hisses.
sonar is an acronym for sound navigation ranging
asdic is an acronym for antisubmarine detection investigation committee
Active sonar can also be used as a deterrent and/or disablement mechanism.
Active sonar relies on an audible "ping" to generate echoes to reveal objects around the submarine.
Active sonar is similar to radar in that, while it allows detection of targets at a certain range, it also enables the emitter to be detected at a far greater range, which is undesirable.