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234 U Unconscious diver At the surface .......................................................... 167 Under water ............................................................ 168 Underwater communication ......................................... 82 Underwater hunters, conservation and ....................... 189 Underwater light ............................................................ 45 Underwater navigation .................................................. 87 Underwater slate ............................................................ 44 Underwear, dry suit ....................................................... 39 Units of pressure .......................................................... 102 U.S. Navy dive tables .................................................... 125 V Valves DIN type .................................................................... 23 J type ......................................................................... 22 K type ........................................................................ 22 Purpose ..................................................................... 23 Vertigo .................................................................. 107, 163 Vest, snorkeling .............................................................. 19 Visibility........................................................................ 180 Vision under water ......................................................... 95 Visual Inspection ........................................................... 23 Volume Closed system .......................................................... 103 Open system ............................................................ 102 Pressure effects ....................................................... 102 W Waiver and release form .................................................. 7 Watch, diving ................................................................. 31 Water Clearing From mask ............................................................ 67 From regulator ...................................................... 69 From snorkel ......................................................... 54 Density and buoyancy .............................................. 97 Entries and exits ....................................................... 61 Getting in and out of ............................................... 61 Handling equipment in ........................................... 85 Inhaling, effects of ................................................. 164 Pressure, physical effects of ................................... 104 Water conditions .......................................................... 180 Water temperature ....................................................... 181 Waves............................................................................ 182 Weights Assembling weight belt ............................................ 58 Belts .......................................................................... 36 Donning weight belt ................................................ 60 Harnesses .................................................................. 36 Keepers ................................................................ 36, 59 Purpose ..................................................................... 36 Quick release ............................................................ 37 Removing and replacing weight belt in water .......................................................... 86 Systems ..................................................................... 36 Types ......................................................................... 36 Wetsuits Choosing based on conditions ................................. 41 Maintenance ............................................................. 42 Operation .................................................................. 38 Options...................................................................... 39 Styles ......................................................................... 39 Thicknesses ............................................................... 39 Women, effects of diving on ............................................ 9 Worksheet ............................See Dive planning worksheet Wrecks, exploring ........................................................ 190 Y Yoke, regulator................................................... 22, 25, 56 NAUI Scuba Diver INDEX


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