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NAUI Scuba Diver 130 Decompression, Dive Tables, and Dive Computers Table 1 – End-Of-Dive Letter Group Table 1 – End-Of-Dive Letter Group gives you a Letter Group designation at the end of your dive (figure 5-8). This table also gives you the Maximum Dive Time (MDT) information for depths from 12 meters to 40 meters (40 feet to 130 feet). The MDTs are the red, circled numbers. The table is arranged with the depths in columns on the left side of the table and the times for each depth in rows across the table. To find your Letter Group, use the following steps: 1. Take the deepest depth you reached during your dive and round it to the next greater depth found in Table 1. For example, if the deepest part of your dive was to 23 meters (75.5 feet), round the number to 24 meters (80 feet). 2. Locate the row corresponding to your deepest depth. 3. Follow the row across until you find the column containing the total time of your dive. You might have to round the total time of your dive to the next greater time found on the table. For example, if the total time for your dive to 23 meters (75.5 feet) was 26 minutes, you must round the time to 30 minutes. 4. Follow the column containing the total time of your dive down until you reach a letter. This is your Letter Group designation for your dive. For example, the Letter Group for the dive to 23 meters (75.5 feet) for 26 minutes, which is rounded to 24 meters (80 feet) for 30 minutes, is G. Verify What You Have Learned Review the following questions about Table 1: 9. If you do a dive to 18 meters (60 feet) for 42 minutes, your Letter Group is ____. 10. If you do a dive to 12 meters (40 feet) for 88 minutes, your Letter Group is ____. 11. If you do a dive to 36 meters (120 feet) for 9 minutes, your Letter Group is ____. Table 2 - Surface Interval Time (SIT) Table The longer you stay on the surface between dives, the more excess nitrogen you eliminate. Table 2 – Surface Interval Time (SIT) Table gives you credit for eliminating nitrogen by changing your Letter Group (figure 5-9). Table 2 consists of blocks containing two numbers. The numbers are expressed as hours and minutes. The lower FIGURE 5-7. THE NAUI DIVE TABLES ARE DESIGNED TO FLOW FROM ONE TABLE TO THE NEXT IN A CONTINUOUS LOOP. FIGURE 5-8. TABLE 1 – END-OF-DIVE LETTER GROUP.


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