DEEPBLU cosmiq+ - Section 9 - Glossary

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SECTION 9 – 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 in order to complete a
mandatory decompression stop.
Central nervous sys-
tem (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 repetitive dives completed within a day or over a number of
days.
Dive time The amount of time that elapses between the beginning of a dive 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 Fly Time Minimum amount of time the diver should wait before embarking on a
ight.
Oxygen level The percentage of oxygen contained in a breathing gas.
SECTION 9 – GLOSSARY