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• 1. INTRODUCTION
1.1. GLOSSARY
AIR: Air dive
ASC:
Total ascent time, the time it takes to perform the ascent from your current
depth to the surface in a decompression dive, including all decompression
stops and assuming an ascent rate of 10m/min or 33ft/min.
ASC + X:
The overall ascent time inclusive of all decompression stops if the dive is
extended by X minutes at the current depth.
AVG: Average depth, calculated from the beginning of the dive.
CNS: Central Nervous System. CNS% is used to quantify toxic effects of oxygen.
DESAT:
Desaturation time. The time needed for the body to eliminate the nitrogen
taken up during diving.
D-TIME: Dive time, the whole time spent below a depth of 1.2m/4ft.
Gas integration:
The feature in Icon HD to include tank pressure information in its
calculations and to display it on the computer screen.
Gas switching: The act of changing from one breathing gas to another.
Max depth: Maximum depth attained during the dive.
MOD:
Maximum Operating Depth. This is the depth at which the partial pressure
of oxygen (ppO
2
) reaches the maximum allowed level (ppO
2
max). Diving
deeper than the MOD will expose the diver to unsafe ppO
2
levels.
Multigas:
Refers to a dive in which more than one breathing gas is used (air and/or
Nitrox).
Nitrox:
A breathing mix made of oxygen and nitrogen, with the oxygen
concentration being 22% or higher.
NO-FLY: Minimum amount of time the diver should wait before taking a plane.
No deco time:
This is the time that you can stay at the current depth and still make
a direct ascent to the surface without having to perform mandatory
decompression stops.
O
2
: Oxygen.
O
2
%: Oxygen concentration used by the computer in all calculations.
P Factor:
Personalization factors, which allow the user to select between the
standard decompression algorithm (P0) and an increasingly more
conservative one (P1, P2).
Pairing:
The act of establishing a coded RF communication between Icon HD and a
dedicated device, such as a tank module.
ppO
2
:
Partial pressure of oxygen. This is the pressure of the oxygen in the
breathing mix. It is a function of depth and oxygen concentration. A ppO
2
higher than 1.6bar is considered dangerous.
ppO
2
max:
The maximum allowed value for ppO
2
. Together with the oxygen
concentration it defines the MOD.
Switch depth:
The depth at which the diver plans to switch to a higher oxygen
concentration mix while using the multigas option.
SURF INT: Surface interval, the time that has elapsed since the end of the dive.
TTR:
Time To Reserve, it is the time that a diver can spend at the current depth
before reaching the tank reserve.
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