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accurate AIR CONSUMPTION analog compass angle base weight basic BOTTOM CONTOUR buddy buddy's buoyancy compensator CHARLES ROYER cold light Colder water consumption rate course cubic foot CYLINDER PRESSURE CUBIC degree markings depth gauge Diagram 1.2 direction dive location Dive Patterns dive team diving equipment familiar feet of air feet per minute gear give the diver Glow Sticks going Half moon search hold the compass imaginary line index marks inside the wreck keep landmark looking low visibility lubber line night dive ninety-degree turn object original heading passageway piece of diving plankton possible pound weight PRESSURE CUBIC FEET Procedure recreational diving reference point remaining air supply respiration rate rope safety line sand scuba divers scuba equipment search area shore silt slate board Sonar sport diver surface swim take a given take a reading technique traveled underwater navigator underwater pressure gauge wave action Wreck diving