Dive computer
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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. A secondary function is to record the dive profile, warn the diver when certain events occur, and provide useful information about the environment.
Hydrospace Explorer Trimix and rebreather dive computer. Suunto Mosquito with aftermarket strap and iDive DAN recreational dive computers
iDive DAN personal dive computer display showing decompression requirement and other data during a dive The central band shows time to surface from current depth, stop depth and stop time.
The dive computer eliminated the previously mandatory interconnected use of three pieces of equipment: diving watch (top right), depth gauge (bottom right) and waterproof decompression table (left).
A dive computer incorporating Nitrox functions (Suunto Vyper Air)
Decompression equipment
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There are several categories of decompression equipment used to help divers decompress, which is the process required to allow divers to return to the surface safely after spending time underwater at higher ambient pressures.
Surface supplied diver on diving stage
BSAC nitrox decompression tables
The PADI Nitrox tables are laid out in what has become a common format for no-stop recreational tables
The PADI recreational dive planner, in "Wheel" format.