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n. A buoy equipped with an acoustic receiver and a radio transmitter that emits radio signals when it detects underwater sounds.

n. A buoy that sends a radio signal when it detects the sound of underwater objects (such as submarines)

"But after World War II, the Navy was interested in developing a so-called "sonobuoy" that would use sonar to detect submarines in the water and transmit the information to an airplane above."

photon-torpedo    rocket-propelled    erector    combat-wasp    torp