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500AI
GLOSSARY
The following are diving terms to become familiar with. Some apply specifically to the 500AI.
Air Dive - A dive conducted using air (approximately 21% oxygen & 79% nitrogen) as the breathing gas.
Algorithm - A step-by-step mathematical formula designed to accomplish a particular result (i.e. Dive Time Remaining in the
500AI).
Altitude Dive - A dive made at an elevation above sea level (2,000+ ft. / 610+ m.) where a different set of no decompression
tables is used .
Ascent Rate - The speed that a diver ascends toward the surface.
Ascent Rate Indicator - A display that shows ascent rate as a bar graph alongside a color–coded indicator.
Audible Alarm - A computer emitted tone that alerts the diver to potential danger.
Breathing Gas Time Remaining - A display of that shows the amount of time remaining based on a calculation of cylinder
pressure, and the diver’s breathing rate and depth.
Caution Zone - The yellow sections of the Bar Graphs that give a visual warning of a diver’s proximity to limits.
Ceiling - See decompression ceiling.
Clean Dive - A dive preceded by 24 hours of no diving activity.
CNS - Abbreviation for the Central Nervous System of the body.
Competitive Dive - A dive conducted for profit or prize.
Compartment - A term applied to the hypothetical modeling of nitrogen absorption in the tissues (more accurate than the
term “tissue” because dive computer models have no direct relation to human tissues).
CZ - Abbreviation for Caution Zone.
DCS - Abbreviation for decompression sickness, i.e., “the bends”.
DECO - Abbreviation for Decompression.
Decompression Ceiling - The shallowest depth a diver may reach upon ascent without risking decompression sickness.
