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.
Wristwatch format housings have become common. They are compact and can also serve as daily wear wristwatches, but the display area is limited by the size of the unit and may be difficult to read for divers with poorer vision, and control buttons are necessarily small and may be awkward to use with thick gloves. Battery life may also be limited by the available volume. which has a prerequisite certification of PADI Open Water Diver, the minimum level certification for autonomous recreational diving. The course comprises up to three classroom sessions and an optional open water dive for a beginner with a minimum experience of four open water dives limited to 18 metres to become a specialist by PADI standards.
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