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7.7. Dive terms
Term Explanation
Altitude dive A dive made at an elevation greater than 300 m (1000
ft) above sea level.
Ascent rate The speed at which the diver ascends toward the
surface.
Ascent time The minimum amount of time needed to reach the
surface on a decompression dive.
CCR Closed-Circuit Rebreather. Scuba that recycles all
exhaled gas.
Ceiling On a decompression dive, the shallowest depth to
which a diver may ascend based on computed inert gas
load.
CNS Central nervous system toxicity. Toxicity is caused by
oxygen. Can cause a variety of neurological symptoms.
The most important of which is an epileptic-like
convulsion which can cause a diver to drown.
CNS% Central nervous system toxicity limit fraction.
Compartment See Tissue group
DCS Decompression sickness/illness. Any of a variety of
maladies resulting either directly or indirectly from the
formation of nitrogen or helium bubbles in tissues or
body fluids, as a result of inadequately controlled
decompression.
Decompression Time spent at a decompression stop, or range, before
surfacing, to allow absorbed nitrogen to escape
naturally from tissues.
Decompression window On a decompression dive, the depth range between the
floor and the ceiling within which a diver must stop for
some time during ascent.
Dive series A group of repetitive dives between which the dive
computer indicates some nitrogen loading is present.
When nitrogen loading reaches zero the dive computer
deactivates.
Dive time Elapsed time between leaving the surface to descend,
and returning to the surface at the end of a dive.
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