228 G Galapagos Islands, diving ........................................... 194 Gauge pressure ............................................................ 102 Gauges Compass.................................................................... 30 Depth gauge ............................................................. 28 Maintenance ............................................................. 30 Pressure gauge ......................................................... 28 Purpose ..................................................................... 27 Gear ........................................................... See Equipment Gear bags ....................................................................... 43 Giant stride entry ........................................................... 62 Gloves Purpose ..................................................................... 19 Selection ................................................................... 19 Types ......................................................................... 19 Goggles ........................................................................... 15 Goodie bag ..................................................................... 44 Great Lakes, diving ...................................................... 193 Gulf of Mexico, diving ................................................. 193 H Hand signals .................................................................. 82 Head cold, diving with ................................................. 109 Head, thermal protection for ......................................... 40 Health considerations ...................................................... 9 Hearing under water ...................................................... 96 Heat loss under water .................................... 96, 119, 160 Heat stroke ................................................................... 161 Heat, effect of, on cylinders ........................................... 23 Hoods.............................................................................. 40 Hoses, regulator ............................................................. 25 Human body Air expansion and .................................................. 112 Air in mask and ...................................................... 111 Air spaces ................................................................ 104 Avoiding squeezes ................................................... 107 Equalizing pressure................................................ 108 Indirect effects of pressure ..................................... 116 Lungs ...................................................................... 112 Pressure on ears ..................................................... 107 Reverse block .................................................. 107, 109 Sinuses .................................................................... 110 Humidity ............................................................................ 120 Hunting ........................................................................ 189 Hydrostatic testing ......................................................... 24 Hyperbaric chamber ............................................ 114, 117 Hyperthermia ............................................................... 161 Hyperventilation .......................................................... 115 Hypothermia ................................................................ 160 I Independent emergency ascents ................................... 79 Indirect effects of pressure ........................................... 116 Indirect pressure .......................................................... 116 Ingassing nitrogen ...................................................... 124 Inhaling water ............................................................. 116 Injuries, lung overexpansion ...................................... 112 Instruments Backup ...................................................................... 32 Compass.................................................................... 30 Computers ................................................................ 31 Depth gauge ............................................................. 28 Maintenance ............................................................. 32 Submersible pressure gauge .................................... 28 Timing devices ......................................................... 31 Insulation, heat loss and ............................................. 161 International dive flag .................................................. 43 In-water artificial respiration...................................... 168 J J valve ............................................................................. 22 Jackets, buoyancy control .............................................. 34 Jellyfish ................................................................. 172, 187 K K valve ............................................................................ 22 Kicking ........................................................................... 50 Knives ............................................................................. 42 NAUI Scuba Diver INDEX
19116TC
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