Related by context. Frequent words. (Click for all words.) 39 sonar 36 underwater 36 frequency sonar 35 Sonar 35 thermal imaging 35 whales dolphins 35 oceanographic 34 marine 34 Underwater 33 bottom trawling 33 remote sensing 32 synthetic aperture radar 32 FLIR 32 multispectral 32 LRAD 32 SONAR 31 cetaceans 31 basking sharks 30 infrared cameras 30 Seabird 30 humpback whales 30 submersible 30 FMT 30 aerial surveillance 30 echolocation 30 marine mammals 30 cetacean 30 infra red 29 seamounts 29 marine mammal 28 LIDAR 28 dolphins 28 navigational aids 28 navy divers 28 longlines 28 submarines 27 narwhal 27 beaked whales 27 infrared imaging 27 Lidar 27 submersibles 27 hydrographic 27 marine biologists 27 orcas 27 ROVs 27 ROV 27 ocean 26 recreational boaters 26 infrared 26 warships 26 autonomous underwater 26 bowhead whales 26 porpoises 26 warship 26 seismometers 26 NOAA 26 Oceanographic 26 TBT 26 thermal imager 25 acoustic 25 endangered whales 25 gill nets 25 whales 25 USCG 25 radio transmitters 25 Deep Sea 25 anti submarine warfare 25 RORC 25 Shellfish 24 navigational 24 night vision goggles 24 whale 24 submarine 24 Infrared 24 SLN 24 navy ships 24 seismic surveys 24 scan sonar 24 infrared laser 24 Acoustic 24 infrared camera 24 spectrometers 24 Tidal 24 Flotation 24 motorboats 24 oceanographers 24 scuba divers 24 infrared sensors 23 tidal 23 scuba gear 23 Humboldt squid 23 seabed 23 Saltwater 23 NOAA Fisheries 23 HMAS Sydney 23 orbiting satellites 23 collision avoidance 23 humpback whale 23 ultrasonic 23 adaptive optics 23 navigation aids