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Crimson Trace is an American manufacturer of laser sight equipment, chiefly but not exclusively for pistols. The firm specializes in in-line upper-grip-mounted red and green laser units, trigger-guard mounted sights, and training units. Crimson Trace partners with manufacturers of firearms in product releases, with many models shipping with ...
The National Association of Underwater Instructors (NAUI Worldwide) is a nonprofit association of scuba instructors founded in 1960 by Albert Tillman and Neal Hess. [2] [3]NAUI primarily serves as a recreational dive certification and membership organization, providing international diver standards and education programs.
Diver Training (60 days, Naval Diving and Salvage Training Center) – Designed to provide qualified non-diving personnel with the basic training necessary to safely and effectively perform as a dive team member/diver in SCUBA and MK-16 UBA in accordance with the U.S. Navy Diving Manual. [5]
A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the elapsed time and depth during a dive and use this data to calculate and display an ascent profile which, according to the programmed decompression algorithm, will give a low risk of decompression sickness.
A US Navy work diver is lowered to the sea bed during a dive from the USNS Grasp off the coast of St. Kitts. Preparing to raise a mine from the seabed. A clearance diver was originally a specialist naval diver who used explosives underwater to remove obstructions to make harbours and shipping channels safe to navigate, but the term "clearance diver" was later used to include other naval ...
Diving masks and Snorkels Accessories - Their accessories line includes dive torches, knives, Surface marker buoys , diving sportswear, bags, weight belts , hangers, dry boxes, etc. In 2019 Mares entered the rebreather market with the launch of the Horizon.
The procedures vary depending on whether the diver is using scuba or surface supplied equipment. Scuba divers control their own descent and ascent rate, while surface supplied divers may control their own ascents and descents, or be lowered and lifted by the surface team, either by their umbilical, or on a diving stage, or in a diving bell.
For safety and efficiency, divers may need to communicate with others diving with them, or with their surface support team. The interface between air and water is an effective barrier to direct sound transmission, [9] and the natural water surface is also a barrier to visual communication across the interface due to internal reflection, particularly when not perfectly smooth.