sonobuoy

[son-uh-boo-e, -boi]
noun Navigation.
a buoy that emits a radio signal on receiving an underwater signal from a vessel.

Origin:
1940–45; sono- + buoy

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Collins
World English Dictionary
sonobuoy (ˈsəʊnəˌbɔɪ)
 
n
a buoy equipped to detect underwater noises and transmit them by radio
 
[from sonic + buoy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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It utilizes a combination of proven sonobuoy sensors and adaptations of current technologies to meet the mission needs.
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