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Rebreather
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A closed-circuit system which filters exhaled air, then recirculates it for rebreathing by the diver; requires special training and maintenance.
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Recreational scuba diving
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Diving to prescribed limits, including a depth no greater than 130 fsw, using only compressed air, and never requiring a decompression stop.
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Regulator
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In scuba, any device that changes air pressure from one level to a lower level.
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Repetitive Dive
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Any dive whose profile is affected by a previous dive is considered repetitive.
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Residual Nitrogen Time
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The time it would take to off-gas any extra nitrogen remaining after a dive. Residual Nitrogen Time is always taken into consideration when determining the safe duration for any repetitive dive.
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Reverse squeeze
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Pain or discomfort in enclosed space (e.g., sinuses, middle ear, inside mask) on ascent from a dive.
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Rip Current
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A strong current of limited area flowing outward from the shore, and may be visible as a band of agitated water with the regular wave pattern altered; current is caused by the rush of escaping water which is piled between shore and bar or reef by wave action through a gap in the bar or reef; such currents are dangerous to the uninitiated and are the cause of many drownings at ocean beaches; however, when located by divers they are often used to facilitate entry to areas beyond the bar or reef.
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Rule of Thirds
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An air management technique. Use a third of the tank to get to your destination, a third to get back, and the last third belongs to your buddy in case of an emergency.
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