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2. Deeper Fishfinder - Wikipedia

   en.wikipedia.org/wiki/Deeper_Fishfinder

   Deeper Smart Sonar is a wireless, castable echo-sounder compatible with iOS and Android smartphones and tablets. Wi-Fi connection enabled to maximize both the distance between the sounder and the device holder up to 330 ft / 100 m and the depth range up to 260 ft / 80 m.

3. List of diving equipment manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_diving_equipment...

   Snead Co., Jersey City N.J. – Shallow water helmets. [129] Snuba – Limited depth airline breathing apparatus towed by the diver; Società Anonima Lavorazioni Vari Appararecchi di Salvataggio (SALVAS) – Italian manufacturer of salvage and diving equipment, Italy: manufactured mostly military salvage equipment, including diving helmets ...

4. AN/SQQ-32 mine-hunting sonar - Wikipedia

   en.wikipedia.org/wiki/AN/SQQ-32_Mine-hunting_sonar

   It provides the operator 180 degrees of selectable coverage via electronic switching of sonar stave arrays circling the towed body. The newest AN/SQQ-32(V)4 upgrade contracted in 2011 includes a high frequency wide band (HFWB) modification that greatly improves shallow-water minehunting capabilities in high clutter environments. [2]

5. Fishfinder - Wikipedia

   en.wikipedia.org/wiki/Fishfinder

   Fishfinders were derived from fathometers, active sonar instruments used for navigation and safety to determine the depth of water. [1] The fathom is a unit of water depth, from which the instrument gets its name. The fathometer is an echo sounding system for measurement of water depth. A fathometer will display water depth and can make an ...

6. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   In shallow water propagation is generally by repeated reflection at the surface and bottom, where considerable losses can occur. Sound propagation is affected by absorption in the water itself as well as at the surface and bottom. This absorption depends upon frequency, with several different mechanisms in sea water.

7. Underwater searches - Wikipedia

   en.wikipedia.org/wiki/Underwater_searches

   They may be anchored in shallow water, or free-floating in deep water. and may be part of a long term early-warning system, or actively used to hunt down enemy vessels. The position of the target is identified by analysing the time difference of the same sound signals either emitted or reflected from the target and received by three or more buoys.