Suunto D3 Instruction Manual page 74

Dive time Elapsed time between leaving the surface to descend,
and returning to the surface at the end of a dive.
EAN Abbreviation for enriched air nitrox.
Enriched Air Nitrox
Oxygen-Nitrogen mix, normally with more than 21%
oxygen.
Freediver A breath-holding diver whose only source of oxygen are
his lungs filled with surface air.
Hypercapnia Increased amount of carbon dioxide in the blood. A
diver who does not rest adequately between breath-hold
dives will have elevated carbon dioxide levels. This can
predispose hin to carbon dioxide toxicity or blackout.
Hyperventilation An increase in rate and/or volume of breathing. Carbon
dioxide blood levels decrease with little corresponding
increase in oxygen blood levels. If the diver engages in
excessive hyperventilation, he may diminish his desire
to breathe, long enough to become unconscious after a
long period of apnea.
Hypoxia A condition that occurs when a diver's tissues do not
receive enough oxygen. Freedivers become hypoxic
when they hold their breath; they can eventually suffer
blackout if they hold their breath too long.
MOD Abbreviation for Maximum Operating Depth. The
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