Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An unmoored sonar buoy equipped with an acoustic receiver and a radio transmitter that emits radio signals when it detects underwater sounds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun nautical, military A buoy that sends a radio signal when it detects the sound of underwater objects (such as submarines)

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From sonar + buoy

Examples

  • 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.

    News

  • SWEET: when used in reference to a sonobuoy, indicates that the buoy is functioning properly, although not necessarily holding any contacts.

    Terror At Dawn

  • It was deeper than the Med, but the bottom was littered with wrecks and uncharted obstructions, all of which interfered with MAD and sonobuoy detections.

    Terror At Dawn

  • HOT: in reference to a sonobuoy, holding enemy contact.

    Terror At Dawn

  • When a submarine changes its course or speed in relation to a sonobuoy, the event shows up as a change in the frequency of the sound source.

    Terror At Dawn

  • SWEET: When used in reference to a sonobuoy, indicates that the buoy is functioning properly, although not necessarily holding any contacts.

    Hellfire

  • HOT: In reference to a sonobuoy, holding enemy contact.

    Hellfire

  • When a submarine changes its course or speed in relation to a sonobuoy, the event shows up as a change in the frequency of the sound source.

    Hellfire

  • Hot: In reference to a sonobuoy, holding enemy contact.

    Joint Operations

  • On the West Coast, SUBPAC. sweet: When used in reference to a sonobuoy, indicates that the buoy is functioning properly, although not necessarily holding any contacts.

    Joint Operations

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