Related by context. Frequent words. (Click for all words.) 54 Sonar 53 marine mammals 51 divers 51 thermal imaging 50 anti submarine warfare 49 underwater 48 infrared 48 infra red 47 oceanographic 47 whales 47 infrared cameras 47 seabed 46 infrared sensors 46 submersibles 46 ground penetrating radar 45 infrared camera 45 scuba divers 45 submersible 44 coastal waters 44 porpoises 44 emergency beacons 44 remotely operated 44 shallow waters 44 navigational 44 gill nets 43 marine mammal 43 sperm whales 43 dolphins 43 GPS 43 bottom trawling 43 submarine 43 seismic surveys 43 whale 43 buoys 42 marine biologists 42 seafloor 42 Coast Guard 42 tidal 42 ultrasonic 41 spy satellites 41 cadaver dogs 41 night vision goggles 41 trawlers 41 remote sensing 41 NOAA 41 Infrared 41 underwater robots 41 ROVs 41 humpback whale 41 humpbacks 41 submarines 40 sea lions 40 undersea 40 aerial surveillance 40 Global Positioning System 40 subsurface 40 navy ships 40 seismometers 40 humpback whales 40 ROV 39 electromagnetic 39 propellers 39 humpback 39 VHF 39 sensor 39 navigation 39 recreational boaters 39 FLIR 39 warship 39 collision avoidance 39 radio transmitters 39 LIDAR 38 Atmospheric Administration 38 dredging 38 detector 38 scuba diver 38 ocean 38 missing boater 38 cetaceans 38 motorboats 38 USCG 38 boaters 38 Divers 38 adaptive optics 38 spectrometers 38 radio transmissions 38 warships 38 oceanographers 38 marine 38 crab pots 38 diver 38 orcas 38 Doppler radar 38 dissolved oxygen 38 NOAA Fisheries 38 sensors 38 sperm whale 38 littoral 38 shoreline 38 shoal 38 scuba gear