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Open-water diving has at least two meanings in underwater diving:
- In diver training, divers progress from learning diving skills in "confined water" (usually swimming pools) to practicing skills in "open water", which normally implies the sea or a lake, including flooded quarries, in which the environment is not restricted to a small, controlled locality and depth, with conditions typical of a natural body of water which might be used by divers. and the range of hazards and associated risk is significantly expanded. In this context confined water is a special case of open water, as it complies with the more general condition of unobstructed access to the surface.
- Diving in an environment where the diver has direct vertical access to the surface of the water in contact with the Earth's atmosphere. "Open water diving" implies that if a problem arises, the diver can directly ascend vertically to the atmosphere to breathe air. Penetration diving—involving entering caves or wrecks, or diving under ice—is therefore not "open water diving". In some contexts the lack of a decompression obligation is considered a necessary condition for classification of a dive as an open water dive, but this does not affect the classification of the venue as open water.
- PADI Instructor Manual Version 2010 (Rev. 1/10), General Standards and Procedures Guide, Page 17.
- Class IV Training Standard Revision 5, October 2007. South African Department of Labour
- Staff (1992). "Section 2". Australian Standard AS2815.3-1992, Training and certification of occupational divers, Part 3: Air diving to 50m. (2nd ed.). Homebush, NSW 2140: Standards Australia. p. 9. ISBN 0 7262 7631 6.
- Staff. "Open Water Diver". Professional Association of Diving Instructors. Retrieved 4 October 2013.
- Staff. "Open Water Diver & Scuba Diver". Scuba Schools International. Retrieved 4 October 2013.
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