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Use the following steps to find your TNT at the end of your repetitive dive: 1. Find your new Letter Group, based on your SIT, in the column on the right side of the table. For example, you have a new Letter Group of C. 2. Move along the row corresponding to your Letter Group until you come to the column corresponding to your deepest depth during the dive. For example, you went to 14 meters (47 feet), which rounds to 15 meters (50 feet). 3. Read the upper number in the block. This is your RNT. For example, the RNT for a dive to 15 meters (50 feet) for Letter Group C is 21 minutes. 4. Add the RNT to your ADT to find your TNT. For example, if your ADT was 35 minutes, you must add your RNT of 21 minutes from step 3 to get a TNT of 56 minutes. Note that the AMDTs and RNTs in each block add up to the circled MDT for each corresponding depth in Table 1. Verify What You Have Learned Review the following questions about Table 3: 15. If you have a new Letter Group of D and you want to dive to 18 meters (60 feet), your AMDT is _____ minutes. 16. If you have a new Letter Group of B and you want to dive to 27 meters (90 feet), your AMDT is _____ minutes. 17. True or False. If you have a new Letter Group of G, you can dive to 24 meters (80 feet) for 32 minutes. 18. If you have a new Letter Group of E and you dive to 17 meters (57 feet), your RNT is _____ minutes. 19. If you have a new Letter Group of G and you dive to 11 meters (37 feet), your RNT is _____ minutes. 20. If you have a new Letter Group of C and you dive to 20 meters (67 feet) for 22 minutes, your TNT is _____ minutes. 21. If you have a new Letter Group of D and you dive to 16.2 meters (54 feet) for 18 minutes, your TNT is _____ minutes. DIVE PLANNING WORKSHEET You must systematically keep track of your depth, dive time, surface interval, Letter Group designations, and other information when you work with the NAUI Dive Tables or NAUI Dive Time Calculator. There is a NAUI Dive Planning Worksheet (figure 5-11) on the back of your NAUI Dive Tables. This section explains how to use the worksheet, which is very useful for helping prevent errors. This method of calculating your dive times is called the profile method. You can write on the NAUI worksheet on your NAUI Dive Tables with a pencil and erase it or scour it clean without damaging the tables. You should use the worksheet on each dive, so take a pencil with you when you go diving and write your dive information directly on the NAUI worksheet. Your NAUI Dive Tables are also waterproof so you can record information on them in the water or refer to the planning information while you are on your dive. In this section, you will see how to use the NAUI Dive Planning Worksheet and your NAUI Dive Tables to make or plan two dives in one day. NAUI Scuba Diver 132 Decompression, Dive Tables, and Dive Computers A B C D E F G H I J K L 7 123 17 113 25 105 37 93 49 81 61 69 73 57 87 43 101 29 116 14 138 161 M. FT. 12 40 15 50 18 60 21 70 24 80 27 90 30 100 33 110 36 120 40 130 6 74 13 67 21 59 29 51 38 42 47 33 56 24 66 14 76 4 87 99 111 5 50 11 44 17 38 24 31 30 25 36 19 44 11 52 61 70 79 88 4 41 9 36 15 30 20 25 26 19 31 14 37 8 43 50 57 64 72 4 31 8 27 13 22 18 17 23 12 28 7 32 38 43 48 54 61 3 22 7 18 11 14 16 9 20 5 24 29 33 38 43 47 53 3 19 7 15 10 12 14 8 18 4 22 26 30 34 38 3 12 69 10 5 13 16 20 24 27 31 39 66 9 12 15 18 21 25 28 35 6 8 11 13 16 19 22 25 NEW GROUP AVOID REPETITIVE DIVES OVER 30 METERS (100') FIGURE 5-10. TABLE 3 – REPETITIVE DIVE TIMETABLE.


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