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2. Underwater locator beacon - Wikipedia

   en.wikipedia.org/wiki/Underwater_locator_beacon

   A 4-inch (100 mm) underwater locator beacon, with ballpoint pen for scale A ULB attached to a bracket on a cockpit voice recorder. An underwater locator beacon (ULB), underwater locating device (ULD), or underwater acoustic beacon is a device that emits an acoustic pulse intended to guide searchers equipped with a suitable receiver to the location of the beacon underwater.

3. Fishfinder - Wikipedia

   en.wikipedia.org/wiki/Fishfinder

   The first fishfinder, i.e. sonar device meant to find underwater fish or schools of fish, was invented in Japan in the 1940s by the Furuno brothers, who were radio repairmen. Building from the knowledge of fishermen who were able to determine the presence of fish, and their number, from bubbles, the Furuno brothers first planned to detect these ...

4. Light level geolocator - Wikipedia

   en.wikipedia.org/wiki/Light_level_geolocator

   A red knot equipped with a GLS.. A light level geolocator, light-level logger or global location sensor (GLS) is a lightweight, electronic archival tracking device, usually used in bird migration research to map migration routes, identify important staging areas, and sometimes provide additional ecological information.

5. Depth finder - Wikipedia

   en.wikipedia.org/wiki/Depth_finder

   A depth finder may refer to any of the following: Sonar: use of underwater sound propagation to measure depth; Fathometer or fishfinder: a device to locate fish at ...

6. Side-scan sonar - Wikipedia

   en.wikipedia.org/wiki/Side-scan_sonar

   The transducers were either contained in one hull-mounted package or with two packages on either side of the vessel. Next the transducers evolved to fan-shaped beams to produce a better "sonogram" or sonar image. In order to get closer to the bottom in deep water the side-scan transducers were placed in a "tow fish" and pulled by a tow cable.

7. CTD (instrument) - Wikipedia

   en.wikipedia.org/wiki/CTD_(instrument)

   The instrument is lowered into the water in what is called the downcast to a determined depth or to a few meters above the ocean floor, generally at a rate of about 0.5 m/s. Most of the time a conducting wire cable is attached to the CTD frame connecting the CTD to an onboard computer, and allows instantaneous uploading and real time ...