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altitude diving
Altitude diving is underwater diving using scuba or surface supplied diving equipment where the surface is 300 meters (1,000 feet) or more above sea level (for example, a mountain lake).〔〔 The U.S. Navy tables recommend that no alteration be made for dives at altitudes lower than 91 meters (300 feet) and dives between 91 meters and 300 meters correction is required for dives over 44 meters sea water (145 feet sea water).〔 Altitude diving is significant in recreational diving because the depths and durations used for dives at altitude are different from those used for the same dive profile at sea level.〔
== Measurement of depth at altitude ==
Special consideration must be given to measurement of depth given the effect of pressure on gauges.
The use of bourdon tube, diaphragm, and digital depth gauges may require adjustment for use at altitude.〔 Capillary gauges have been shown to be a conservative method for measurement of compensated depth at altitude.〔 Modern dive computers detect changes in altitude and automatically adjust their calculation of a safe decompression regime for a dive at that altitude. If an altitude-aware computer is not used, altitude decompression tables must be used.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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