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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.
Oceanic is an American manufacturer of scuba gear. It was founded by Bob Hollis in 1972 and is based in San Leandro , California , United States. [ 1 ] Its products include dive computers , rebreathers and a novel diving mask incorporating a heads-up-display of information.
The Shearwater NERD was released at Dive 2013 in Birmingham, UK. [19] Shearwater Perdix in compass mode. In 2015, the Perdix wrist mounted dive computer was released. The Perdix is similar to the Petrel but has a 30% longer battery life and a thinner and lower profile. [20] The computer was named after the grey partridge Perdix perdix. [21]
A dive computer may be used to help judge this speed, and if worn on the wrist can usually be monitored while winding in the line, allowing for precise and reliable depth control, and where the computer has an ascent rate indicator, also accurate control of ascent rate. [7] [6]
The Orca Edge was an early example of a dive computer that ran a real time algorithm. [2] Designed by Craig Barshinger , Karl E. Huggins and Paul Heinmiller, the Edge did not display a decompression plan, but instead showed the ceiling or the so-called "safe-ascent-depth" and a graphic display of calculated tissue gas loadings.
Solo and technical divers may also carry a backup mask, dive computer, decompression gas and other equipment based on risk assessment for the planned dive. [18] Some backup equipment may be spread amongst a diving team, when instant availability is nor critical, this practice is termed team redundancy .
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