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The decompression tables or software used to plan the dive, [22] The equipment used to control and monitor depth and dive time, such as: personal dive computers, depth gauges, and timers, [23] Shot lines, surface marker buoys (SMBs), Decompression buoys (DSMBs) and decompression trapezes [23] diving stages (baskets), wet and dry bells,
Divers Alert Network (DAN) is a group of not-for-profit organisations dedicated to improving diving safety for all divers. It was founded in Durham, North Carolina, in 1980 at Duke University to provide 24/7 telephone diving medical assistance.
Ratio decompression (usually referred to in abbreviated form as ratio deco) is a technique for calculating decompression schedules for scuba divers engaged in deep diving without using dive tables, decompression software or a dive computer.
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.
The calculations assume that the dive profile, including decompression, is known, but the process may be iterative, involving changes to the dive profile as a consequence of the gas requirement calculation, or changes to the gas mixtures chosen. [11] [5] Scuba gas planning includes the following aspects: [11] [5] Choice of breathing gases
Technical diver decompressing after a mixed gas dive to 60m. A Pyle stop is a type of short, optional deep decompression stop performed by scuba divers at depths well below the first decompression stop mandated by a conventional dissolved phase decompression algorithm, such as the US Navy or Bühlmann decompression algorithms.
In 2000, IANTD introduced a free-diver program prepared by Divetech Ltd of Grand Cayman. [ 3 ] On January 7, 2016 IANTD becomes the first agency in the scuba industry to acknowledge digitally validated logs as an official proof of diving experience, [ 4 ] furthermore it declares Diviac its official digital logbook.
The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.