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COSMIQ
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Dive Computer
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10. Glossary
Ascent rate The speed (measured in meters/feet per minute) at which a
diver ascends towards the surface.
Ceiling depth The shallowest depth to which a diver can ascend to
complete a mandatory decompression stop.
Central nervous
system (CNS) oxygen
toxicity
A measurement of the level of oxygen exposure in the
body’s central nervous system. The CNS oxygen toxicity
level is expressed as a percentage. A CNS level of 100% is
considered extremely dangerous.
Decompression
illness (DCI)
Illness that results from a reduction in the ambient pressure
surrounding one’s body and the formation of nitrogen
bubbles in the blood. DCI encompasses two diseases,
decompression sickness (DCS) and arterial gas embolism
(AGE).
Dive series A number of dives completed within a day or over a number
of days.
Dive time The amount of time elapsed between the beginning and
the end of a dive.
Maximum operating
depth (MOD)
The depth limit which the PPO
2
level exceeds the maximum
allowable level, based on the limit set (1.2 bar to 1.6 bar).
Diving below the MOD may expose the diver to unsafe PPO
2
levels.
Nitrox Also called enriched air nitrox. A mixture of nitrogen and
oxygen used as a breathing gas by divers which contains a
higher proportion of oxygen than is normally contained in
Standard Air (above 21%).
No-decompression
limit (NDL)
The maximum amount of time a diver may remain at a
certain depth before requiring a decompression stop.
No-dive time Minimum amount of time a diver should wait before
beginning another dive.
No-ytime Minimum amount of time the diver should wait before
embarkingonaight.
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