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9. GLOSSARY
Air Time The amount of dive time remaining, based on
a calculation of cylinder pressure and
ambient pressure and present air consump-
tion.
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.
ASC RATE Abbreviation for ascent rate.
Ascent time The minimum amount of time needed to
reach the surface on a decompression stop
dive.
ASC TIME Abbreviation for ascent time.
Ceiling On a decompression stop dive the shallow-
est depth to which a diver may ascend
based on computer nitrogen load.
Ceiling Zone On a decompression stop dive the zone
between the ceiling and the ceiling plus 1.8
m [6 ft]. This depth range is displayed with
the two arrows pointing toward each other
(the ”hour glass” icon).
CNS Abbreviation for Central Nervous System
toxicity.
Central Nervous System Toxicity
Toxicity 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.
Also note Oxygen Limit Fraction
Compartment See “Tissue group”.
DAN Divers Alert Network.
DCI Abbreviation for decompression illness.