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# Definitions

ADT - Actual Dive Time, or the total time spent underwater during a dive. This number is in minutes.
RNT - Residual Nitrogen Time, or the amount measured in minutes of Nitrogen still in a diver's body after a dive.
TNT - Total Nitrogen Time, calculated by adding ADT and RNT. This number is used when getting the End-of-Dive group letter from Table 1 for repetitive dives.
SIT - Surface Interval Time, or the amount of time spent above water after a dive. Table 2 of the NAUI dive tables uses the SIT to calculate a new dive group, because Nitrogen is "offgassed" during this time. Enter this in minutes into DiveCalc - e.g. 2 hours, 35 minutes = 155 minutes.
(A)MDT - (Adjusted) Maximum Dive Time. This is the maximum amount of time that a diver can spend at the given depth. The word "Adjusted" is in parenthesis because the Maximum Dive Time is adjusted for repetitive dives to account for Residual Nitrogen in the body (see RNT). This is done on Table 3 of the NAUI Dive Tables.

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