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
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. |
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