A sonar buoy adapted to be deployed by a cruise missile. This sonar buoy includes a flotation device for keeping a portion of the buoy afloat, a hydrophone, a transmitter for communicating contact and position information and releasable means for attaching the sonar buoy to the cruise missile. By means of this device, a means of monitoring littoral and other waters for enemy submarines and other threats is provided with a low degree of risk to friendly forces. A system for deploying this sonar buoy in a sonar buoy field is also disclosed.
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