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No decompression dive
Any dive which permits a direct, uninterrupted ascent to the surface at any
time.
NO DEC TIME
Abbreviation for nodecompression time limit.
OEA = EAN= EANx
Abbreviations for oxygenenriched air nitrox.
OLF
Abbreviation for oxygenlimit fraction.
OTU
Abbreviation for oxygentolerance unit.
Oxygen tolerance unit
Used to measurethe whole-body-toxicity.
Oxygen limit fraction
AtermusedbySuunto forthevaluesdisplayedin theoxygentoxicitybargraph.
The value iseither the CNS% orthe OTU%.
O
2
%
Oxygen percentage or oxygen fractionin the breathing gas. Standard air has
21% oxygen.
Oxygen partial pressure
Limitsthe maximumdepth towhich thenitrox mixturecan besafely used.The
maximumpartialpressurelimitforenriched airdiving is1.4bar.Thecontingency
partial pressure limitis 1.6 bar. Divesbeyond this limit riskimmediate oxygen
toxicity.
PFO
Abbreviation for patent foramen ovale. It is a form of congenital heart defect
thatenablesbloodflow betweentheleftandright atriaviatheinteratrialseptum.
PO
2
Abbreviation for oxygenpartial pressure.
RGBM
Abbreviation for ReducedGradient Bubble Model.
Reduced Gradient BubbleModel
Modern algorithm fortracking both dissolved andfree gas indivers.
Repetitive dive
Any dive whose decompression time limits are affected by residual nitrogen
absorbed during previousdives.
Residual nitrogen
The amount ofexcess nitrogen remaining ina diver afterone or more dives.
SURF TIME
Abbreviation for surfaceinterval time.
Surface interval time
Elapsed time between surfacing from a dive and beginning a descent forthe
subsequent repetitive dive.
Technical dive
A dive madewith two or morebreathing gas mixes.
Tissuegroup
Theoreticalconceptusedto modelbodilytissuesforthe constructionofdecom-
pression tables orcalculations.
Trimix
A breathing gasmix of helium, oxygenand nitrogen.
UHMS
Abbreviation for Underseaand Hyperbaric Medical Society.
Whole-body toxicity
Another form of oxygen toxicity, which is caused by prolonged exposure to
high oxygen partial pressures. The most common symptoms are irritation in
thelungs, aburningsensation inthe chest,coughing andreductionof thevital
capacity. Alsocalled Pulmonary Oxygen Toxicity. See alsoOTU.
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