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A depth gauge is an instrument for measuring depth below a vertical reference surface. They include depth gauges for underwater diving and similar applications. A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough ...
The depth range applicable to scuba diving depends on the application and training. Entry-level divers are expected to limit themselves to about 60 feet (18 m) to 20 metres (66 ft). [99] The major worldwide recreational diver certification agencies consider 130 feet (40 m) to be the limit for recreational diving.
Some digital depth gauges also indicate ascent rate which is an important factor in avoiding decompression sickness; Pneumofathometer is the surface supplied diving depth gauge which displays the depth of the diver at the surface control panel. It uses hydrostatic back-pressure on a low flow rate open ended air hose to the diver to indicate depth.
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.
4.12 Depth Gauge. 4.13 Compass. 4.14 Variation to ... The DIR philosophy is now used as a basis for teaching scuba diving from entry-level to technical and cave ...
A diver's watch and accurate depth gauge were the original tools for this purpose, but have been largely superseded by electronic bottom timers or dive computers for scuba divers, though a stopwatch and pneumofathometer are still commonly used for monitoring ascent and decompression by surface supplied divers.
Closed diving bell used to transfer saturation divers between the accommodation chamber and the underwater workplace. Saturation divers are lowered to the working depth and raised back to the surface in closed diving bells, which are pressurized to the same pressure as the dive depth. The diver is transferred to and from the hyperbaric ...
Main article: Dive profile. The variation of depth with elapsed time during a dive, often depicted as a graph. dive site. Main article: Dive site. The place at which the dive occurs. Also, more broadly, a place at which diving occurs, has occurred, or is planned to occur, and the general locality, with extent depending on context.
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