The helicopter hunted submarines with its AQS-13F dipping sonar, and carried a 6-tube sonobuoy launcher. Sonobuoy Receivers, and the ASQ-81 Magnetic Anomaly Detector. Another invention was the American 3-cm radar and sonobuoy. The Directional Hydrophone Command Activated Sonobuoy system (DICASS) both generate sound and listen for it. Active sonobuoy fields may be operated multistatically. It is launched from a sonobuoy canister with the wings deploying in early flight phase. This information is analyzed by computers, acoustic operators and TACCOs to interpret the sonobuoy information.