107
9. GLOSSARY
Altitude dive A dive made at an elevation greater than 300 m [1000 ft]
above sea level.
Apnea Absence of breathing. Freedivers are apneic throughout the
duration of their dive.
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
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.
