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12. GLOSSARY
Air Time The amount of dive time remaining, based on a calculation
of cylinder pressure and ambient pressure and present air
consumption.
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 shallowest 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.
