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The National Association of Underwater Instructors (NAUI Worldwide) is a nonprofit association of scuba instructors founded in 1960 by Albert Tillman and Neal Hess. [2] [3]NAUI primarily serves as a recreational dive certification and membership organization, providing international diver standards and education programs.
For this reason, dive tables typically have a degree of conservatism built into their recommendations. Divers can and do suffer decompression sickness while remaining inside NDLs, though the incidence is very low. [17] On dive tables a set of NDLs for a range of depth intervals is printed in a grid that can be used to plan dives. [18]
BSAC nitrox decompression tables The PADI Nitrox tables are laid out in what has become a common format for no-stop recreational tables. Dive tables or decompression tables are tabulated data, often in the form of printed cards or booklets, that allow divers to determine a decompression schedule for a given dive profile and breathing gas. [6]
Basic decompression theory and use of decompression tables is part of the theory component of training for commercial divers, [130] and dive planning based on decompression tables, and the practice and field management of decompression is a significant part of the work of the diving supervisor.
A no-decompression dive, or more accurately, a dive with no-stop decompression, relies on limiting the ascent rate for avoidance of excessive bubble formation in the fastest tissues. The elapsed time at surface pressure immediately after a dive is also an important part of decompression and can be thought of as the last decompression stop of a ...
Decompression calculations using dive tables for multi-level dives were moderately common practice for advanced recreational diving before dive computers were widely used. [3] Where the dive site and underwater topography permit, divers often prefer to descend initially to maximum depth and slowly ascend throughout the dive. A slow ascent, and ...
The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.
The initial dive uses table A, and the diver is allocated a Surfacing Code based on depth and time of the dive. After a surface interval of at least 15 minutes the diver can select a new Current Tissue Code which models the residual nitrogen load, and uses this code to select the repetitive dive table. [93]