Noun
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: WordNetSo, 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. Rick Riordan
sonar is an acronym for sound navigation ranging Source: Internet
asdic is an acronym for antisubmarine detection investigation committee Source: Internet
Active sonar can also be used as a deterrent and/or disablement mechanism. Source: Internet
Active sonar relies on an audible "ping" to generate echoes to reveal objects around the submarine. Source: Internet
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. Source: Internet