the shape of a grid or other array formation and complex beamforming signal processing is used to transcend the capabilities of single, or limited numbers of, hydrophones. See also GPS sonobuoy References External links Sparton Sonobuoys Ultra Electronics - Maritime Systems Ultra Electronics - USSI Ultra Electronics - Sonar Systems Ultra Electronics - Flightline Systems Sonobuoy TechSystems Early sonobuoy development via NDRC WWII Radio sonobuoy in Naval Sonar Ch. 16 AN/CRT-1A Sonobuoy Illustration of AN/CRT-1A Sonobuoy Mini-Jezebel - A giant reduction in Sonobuoy size - a 1977 Flight International advertisement for the Mini-Jezebel sonobuoy Harris Sonobuoy Launching Systems Anti-submarine warfare Sonar