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Multi level dive
A single or repetitivedive that includes time spentat various depths and
whose no decompression limits are therefore not determined solely by
the maximum depth attained.
Nitrox
In sports diving, refers to any mix with a higher fraction of oxygen than
standard air.
NOAA
United States National Oceanic and AtmosphericAdministration.
No decompression time
The maximum amount of time a diver may remain at a particular depth
without having tomake decompression stops during thesubsequent as-
cent.
No decompression dive
Any dive which permits a direct, uninterrupted ascent to the surface at
any time.
NO DEC TIME
Abbreviation for no decompression time limit.
OEA = EAN = EANx
Abbreviations for oxygen enriched air nitrox.
OLF
Abbreviation for oxygen limit fraction.
OTU
Abbreviation for oxygen tolerance unit.
Oxygen tolerance unit
Used to measure the whole-body-toxicity.
Oxygen limit fraction
A termused bySuunto forthe valuesdisplayed inthe oxygen toxicitybar
graph. The value is either the CNS%or the OTU%.
O
2
%
Oxygen percentageor oxygen fractionin thebreathing gas. Standardair
has 21% oxygen.
Oxygen partial pressure
Limitsthe maximumdepth towhich thenitrox mixturecan besafely used.
The maximumpartial pressure limitfor enriched airdiving is 1.4bar. The
contingency partial pressure limit is 1.6 bar. Dives beyond this limit risk
immediate oxygen toxicity.
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