231 Over heating ........................................................... 161 Overexertion ........................................................... 166 Seasickness ............................................................. 164 PSI .............................. See Pounds per square inch (psi) Purge button, regulator ........................................... 30, 69 R Rapture of the deep ..................................................... 117 Rebound effect, sinus block and ................................. 110 Recompression chamber ..................................... 114, 171 Recording dives............................................................ 155 Recreational depth limits ............................................ 125 Refraction of light under water .................................... 95 Regulators Alternate air sources ................................................. 26 Annual service .......................................................... 31 Blast clear ................................................................. 69 Breathing from free-flowing .................................... 70 Breathing underwater .............................................. 69 Breathing without a mask ....................................... 69 Clearing .................................................................... 69 Exhaling when out of mouth .................................. 69 First stage .................................................................. 25 Maintenance ............................................................. 30 Octopus regulator ..................................................... 26 Position of alternate mouthpiece ............................ 26 Purge clear ............................................................... 69 Purpose ..................................................................... 25 Recovering Sweep ..................................................................... 69 Reach..................................................................... 70 Second stage ............................................................. 26 Repetitive Dive timetable ............................................. 131 Repetitive dives, time limits for ................................... 135 Required decompression ............................................. 138 Rescues, diving ............................................................ 167 Residual nitrogen ........................................................ 126 Resistance of the water .................................................. 97 Respiration, artificial, in-water ................................... 168 Responsible boat diving .............................................. 210 Responsible scuba diving .................................... 201, 211 INDEX Reverse block ............................................................... 107 Rip currents ................................................................. 183 Risks ................................................................................. 7 S Safety Air starvation and ................................................... 115 Aquatic life injuries ................................................ 171 Buddy system ............................................................ 80 Choking under water ............................................. 164 Communication and................................................ 82 Coughing under water ........................................... 164 Cramps.................................................................... 162 Disorientation ......................................................... 163 Diving situations .................................................... 160 Diving rescues ........................................................ 167 Emergency ascents ................................................... 79 Entanglements ....................................................... 162 Equipment difficulties............................................ 163 First aid ................................................................... 169 Hand signals and ..................................................... 82 Helping other divers ............................................... 165 In-water artificial respiration ................................ 168 Lost buddy procedure ....................................... 81, 153 Planning for ................................................... 153, 172 Planning your dive ................................................ 150 Responsible scuba diving practices ....................... 172 Seasickness ............................................................. 164 Sharing air ............................................................... 77 Site orientation ....................................................... 178 Skills ......................................................................... 77 Solving problems.................................................... 160 Sound signals and .................................................... 82 Unconscious diver .................................................. 167 Safety stop ......... See Precautionary decompression stop Saliva, and mask fogging ............................... 16, 48, 120 Salt water pressure ....................................................... 101 Scrolling, dive computer ............................................. 144 Scuba certification ........................................................... 5 Scuba diving Apprehension .............................................................. 8 INDEX
20490TC
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