NAUI Master Scuba Diver 174 Decompression and Recompression ELEVATION/ALTITUDE (METERS) 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 Measured Depth Theoretical Depth at Altitude for a Given Measured Depth (mfw) 0 0 0 0 0 0 0 0 0 0 0 3.0 3.1 3.3 3.4 3.5 3.7 3.8 3.9 4.1 4.2 4.4 6.1 6.3 6.5 6.8 7.0 7.3 7.6 7.9 8.2 8.5 8.8 9.1 9.4 9.8 10.2 10.6 11.0 11.4 11.8 12.3 12.7 13.2 12.2 12.6 13.1 13.6 14.1 14.7 15.2 15.7 16.3 17.0 17.6 15.2 15.7 16.3 16.9 17.6 18.3 19.0 19.7 20.4 21.2 22.0 18.3 18.9 19.6 20.3 21.1 22.0 22.8 23.6 24.5 25.5 26.4 21.3 22.0 22.8 23.7 24.6 25.6 26.5 27.6 28.6 29.7 30.8 24.4 25.1 26.1 27.1 28.1 29.3 30.3 31.5 32.7 33.9 35.2 27.4 28.3 29.4 30.5 31.7 33.0 34.1 35.4 36.8 38.2 39.6 30.5 31.4 32.6 33.9 35.2 36.6 37.9 39.4 40.9 42.4 44.1 33.5 34.6 35.9 37.3 38.7 40.3 41.7 43.3 45.0 46.7 48.5 36.6 37.7 39.2 40.7 42.2 44.0 45.5 47.2 49.0 50.9 52.9 39.6 40.9 42.4 44.0 45.7 47.6 49.3 51.2 53.1 55.2 57.3 42.7 44.0 45.7 47.4 49.2 51.3 53.1 55.1 57.2 59.4 61.7 ELEVATION/ALTITUDE (FEET) 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Measured Depth Theoretical Depth at Altitude for a Given Measured Depth (ffw) 0 0 0 0 0 0 0 0 0 0 0 10 10 11 11 12 12 13 13 14 14 15 20 21 22 22 23 24 25 26 27 28 29 30 31 32 34 35 36 38 39 41 42 44 40 42 43 45 47 48 50 52 54 56 59 50 52 54 56 58 60 63 65 68 70 73 60 62 65 67 70 73 75 78 81 84 88 70 73 76 78 81 85 88 91 95 99 102 80 83 86 90 93 97 100 104 108 113 117 90 93 97 101 105 109 113 117 122 127 132 100 104 108 112 116 121 126 130 136 141 146 110 114 119 123 128 133 138 144 149 155 161 120 125 129 134 140 145 151 157 163 169 176 130 135 140 146 151 157 163 170 176 183 190 140 145 151 157 163 169 176 183 190 197 205 Should you choose to use an oil-filled Bourdon tube or diaphragm depth gauge that cannot be adjusted for altitude, a rather complex procedure is required to reduce the ascent rate (actual and gauge indicated) to less than 9 m/min (30 ft/min). Tables 5-7a and 5-7b yield equivalent fresh water ascent rates at altitude for the ocean ascent rates. If you use a dive computer, it must be suitable for the altitude where you will dive. Be sure to use your back-up devices if you are using a computer. The theoretical depth at altitude for actual diving depth in fresh water is shown in table 5-8a and 5-8b. These are based upon one table originally developed by E.R. Cross for calculations when diving at altitude. These calculations are based upon U.S. Navy tables and must be used with them for accuracy and safety. Decompression stops must be modified for fresh water and altitude. Table 5-9 provides information which allows you to calculate proper decompression stop depths that correctly correspond to the standard ocean stop depths. PSI per FFW = 0.432 Theoretical Depth = PSI per FFW * Measured Depth / Atmospheric Pressure in PSI*34 TABLE 5-8B. SUMMARY OF ALTITUDE PROCEDURES. PSI per MFW = 0.432 / 0.3048 = 1.41732283464567 Theoretical Depth = PSI per MFW * Measured Depth / Atmospheric Pressure in PSI * 10.3 TABLE 5-8A. SUMMARY OF ALTITUDE PROCEDURES.
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