Related by context. Frequent words. (Click for all words.) 62 sonar 60 hydrophones 58 hydrophone 57 sonars 52 Aegis radar 51 underwater sonar 50 bone conduction 50 VHF radios 49 pingers 48 Aegis destroyers 48 echolocation 47 ocean buoys 47 AUVs 47 infrared beam 47 unmanned underwater 46 EPIRBs 46 radar altimeter 46 propulsion 46 inertial navigation 46 EA 6B Prowler 46 foghorns 46 UUV 46 altimeters 46 undersea warfare 45 AESA radar 45 unpowered 45 SIGINT 45 infra red 45 reconnaissance satellites 44 submarines 44 Iridium OpenPort 44 frequency sonar 44 radars 44 autonomous underwater 44 VHF 44 emergency locator transmitter 44 synthetic aperture radar 44 sensor 44 electromagnetic 44 pinger 44 propellers 44 warships 44 DGPS 43 sensors 43 EPIRB 43 Automatic Identification System 43 VHF radio 43 SQUID 43 Aegis destroyer 43 anti submarine warfare 42 spy satellites 42 Sonar 42 Global Positioning System 42 torpedo tubes 42 submarine warfare 42 infrasound 42 infrared sensor 42 hydraulic steering 42 Unmanned Aerial Vehicles 42 submarine 42 LRAD 42 orbiting satellites 42 electric propulsion 42 ECDIS 42 Kongsberg Maritime 42 navy destroyer 42 remotely piloted 42 submersible 42 GPS 42 ships 41 infrared 41 datalink 41 naval ships 41 naval vessels 41 navies 41 infrared sensors 41 ScanEagle 41 beaked whales 41 geostationary satellites 41 GPS satellites 41 GPS locators 41 satellites 41 RIMPAC 41 directional antenna 41 P 8A 41 distress beacon 41 Aegis Ballistic Missile Defense 41 tidal turbines 41 vibration 41 kite surfers 41 UAVs 41 missile interceptor 41 radiation detector 41 P 8A Poseidon 41 submersibles 41 Unmanned Aerial Vehicles UAVs 41 minesweepers 41 ion propulsion 41 Global Hawk 40 optical telescopes 40 collision avoidance systems