sonobuoy(redirected from Sonar buoys)
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An unmoored sonar buoy equipped with an acoustic receiver and a radio transmitter that emits radio signals when it detects underwater sounds.
(Navigation) a buoy equipped to detect underwater noises and transmit them by radio
[from sonic + buoy]
A sonar device used to detect submerged submarines that, when activated, relays information by radio. It may be active directional or nondirectional, or it may be passive directional or nondirectional.