![]() ![]() The tables show you how to subtract this time from the normal dive time limits, which results in a shorter time limit for your repetitive dive. When you start a dive again to a given depth, your Letter Group at that time determines the time representing the residual nitrogen in your body. As you spend time on the surface between dives, you are assigned to “lower” Letter Groups as you offgas nitrogen. When you dive, a Letter Group from the tables designates the amount of nitrogen you have absorbed during the dive. The letter A represents a small amount of nitrogen and the amount of nitrogen increases as the letters progress towards L. The letters range in sequence from A to L. The NAUI Dive Tables use a Letter Group designation to express the amount of residual nitrogen in your body. NAUI naturally recommends that each diver own a personal copy of the tables. Please note that due to differing screen resolutions and color depths, not everyone will see the data equally clearly. ![]()
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