GLOSSARY
Air time
Altitude dive
Ascent rate
ASC RATE
Ascent time
ASC TIME
Ceiling
Ceiling zone
Central nervous system toxicity
CNS
CNS%
Compartment
DAN
DCI
Decompression
Decompression range
Decompression illness
Dive series
Dive time
ΔP
EAD
EAN
Enriched air nitrox
Equivalent air depth
Floor
Half time
HP
The amount of dive time remaining, based on a calculation of cylinder pressure and ambient pressure and present air consumption.
A dive made at an elevation greater than 300 m/1000 ft above sea level.
The speed at which the diver ascends toward the surface.
Abbreviation for ascent rate.
The minimum amount of time needed to reach the surface on a decompression stop dive.
Abbreviation for ascent time.
On a decompression stop dive, the shallowest depth to which a diver may ascend based on computed nitrogen load.
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 two arrows pointing toward each other (the ”hour glass” icon).
Toxicity caused by oxygen. Can cause a variety of neurological symptoms. The most important of which is an
Abbreviation for central nervous system toxicity.
Central nervous system toxicity limit fraction. Also note Oxygen Limit Fraction
See "Tissue group".
Abbreviation for Divers Alert Network.
Abbreviation for decompression illness.
Time spent at a decompression stop, or range, before surfacing, to allow absorbed nitrogen to escape naturally from tissues
On a decompression stop dive, the depth range between the floor and the ceiling within which a diver must stop for some time during ascent.
Any of a variety of maladies resulting either directly or indirectly from the formation of nitrogen bubbles in tissues or body fluids, as a result of inadequately controlled decompression. Commonly called "the bends" or "DCI".
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.
Elapsed time between leaving the surface to descend, and returning to the surface at the end of a dive.
Delta P, describing the Cylinder Pressure drop during the dive; the difference in cylinder pressure between the beginning and end of a dive.
Abbreviation for equivalent air depth.
Abbreviation for enriched air nitrox.
Also called nitrox or Enriched Air = EANx. Air that has some oxygen added. Standard mixes are EAN32 (NOAA Nitrox I = NN I) and EAN36 (NOAA Nitrox II = NN II).
Nitrogen partial pressure equivalent table.
The deepest depth during a decompression stop dive at which decompression takes place.
After a change in ambient pressure, the amount of time required for the partial pressure of nitrogen in a theoretical compartment to go half way from its previous value to saturation at the new ambient pressure.
Abbreviation for high pressure (= cylinder pressure).
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