pulse generator

longline, remus, hydrophone, echo sounder, divers, underwater, infrared, minisub, whales, echolocation, oceanographic, seabed, porpoises, submersible, purse seine, toadfish, lanternfish, purse seining, dolphins, spectrographic, bathymetry, geophone, bathyscaph, buoys, shoaling, hydrographic, submarine, subantarctic, seafloor, beaked whale, maccheroni, fluorometer, harbor porpoise, gillnet, gradiometer, ultrasonic, humpback whale, humpbacks, narwhal, celestial navigation, undersea, multispectral, toothed whale, cetacean, subsurface, trawlers, global positioning system, electromagnetic, nuwc, vhf, loran, homing torpedo, intertidal, fin whale, boaters, ocean, sextants, navigation, sensor, ballistic trajectory, fringing reef, warship, bathyscaphe, minke whale, gyrocompass, dredging, scuba diver, orcas, propellers, seiners, detector, spectrometers, tullibee, corbina, uscg, telescopes, seiche, deimos, littoral, marine, demersal, shoreline, echoscope, trawling, hydroid, minesweeping, fishermen, pinger, bioluminescence, basking shark, hydrodynamic, inertial navigation system, sand lance, seabirds, domoic acid, bycatch, sea, image intensifier, oceanographers, torpedos, seismometer, sonobuoy, radar, radars, radiometer, transmitter, wireless, anemometer, binoculars, counter, equipments, interferometer, receivers, sonars, altimeter, galvanometer, launcher, magnetometer, microscope, microwave, radiator, torpedoes, interferometric, realtime, thermographic, biometric, computerized, polarimetric, multiband, multichannel, omnidirectional, photogrammetric, radiometric, spectrometric, optoelectronic, scanning

asdic, echo sounder, ping, pinger

pigboat, sub, u-boat

measuring instrument, measuring system