CHAPTER 9 — Air DecompressionChange A 9-41From Table 9-4, repetitive group upon arrival at 6000 feet is Group E. During 90minutes at altitude, the diver will desaturate to Group D. From Table 9-3, sea levelequivalent depth for a 100 fsw dive is 130 fsw. From Table 9-7, residual nitrogentime for a 130 fsw dive in Group D is 11 minutes. The diver should add 11minutes to bottom time.Table 9-4 can also be used when a diver who is fully equilibrated at one altitudeascends to and dives at a higher altitude. Enter Table 9-4 with the differencebetween the two altitudes to determine an initial repetitive group.Example: Divers equilibrated at a base camp altitude of 6000 feet, fly by heli-copter to the dive site at 10,000 feet. The difference between the altitudes is 4000feet. From Table 9-4, the initial repetitive group to be used at 10,000 feet is GroupC. WARNINGAltitudes above 10,000 feet can impose serious stress on the bodyresulting in significant medical problems while the acclimatizationprocess takes place. Ascents to these altitudes must be slow to allowacclimatization to occur and prophylactic drugs may be required. Theseexposures should always be planned in consultation with a DivingMedical Officer. Commands conducting diving operations above 10,000feet may obtain the appropriate decompression procedures fromNAVSEA 00C. 9-12.5Diving At Altitude Worksheet. Figure 9-21 is a worksheet for altitude diving. Todetermine Sea Level Equivalent Depth (SLED) and corrected decompressionstops for an altitude dive, follow these steps:9-12.5.1Corrections for Depth of Dive at Altitude and In-Water Stops.Table 9-4. Repetitive Groups Associated with Initial Ascent to Altitude.Altitude (feet)Repetitive Group1000A2000B3000B4000C5000D6000E7000E8000F9000G10000H.
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