SubGear xp-3h - Diving in Mountain Lakes; Altitude Ranges

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WARNING
If the "no-dive" warning is visible during the surface interval, the diver should not undertake
another dive.
Residual nitrogen
bar
Oxygen toxicity
Desaturation time
To check the remaining desaturation time and
oxygen toxicity press .
Desaturation time is determined either by oxygen
toxicity, nitrogen saturation or the regression of
microbubbles, depending on which requires the
longer time.
Surface interval
To check the elapsed surface interval
press .
If Subgear XP-3H detects a situation of increased risk (due to the potential of
microbubble accumulation from previous dives or a CNS O
2 level above 40%), the
no-dive symbol will appear on the display. The duration of the no-dive warning is visible
in the dive planner menu. Subgear XP-3H recommends this as minimum surface
interval in order to reduce the number of microbubbles and/or to reduce the CNS O2
level below 40%.

You should not undertake a dive as long as the no-dive warning message is displayed
on the computer screen. If the warning is prompted by microbubble accumulation (as
opposed to CNS O2 over 40%) and you dive anyway, you will have shorter no-stop
times or longer decompression times. Moreover, the duration of the no-dive warning at
the end of the dive can increase considerably.
4.6 Diving in mountain lakes
4.6.1 Altitude ranges
Subgear XP-3H measures the atmospheric pressure every 60 seconds even
while the display is switched off. If the computer detects a sufficient increase in
altitude, it switches on automatically and indicates the new altitude range (1-4)
and the desaturation time. Desaturation time indicated at this moment refers to
adaptation time at this altitude. If the dive starts within this adaptation time,
Subgear XP-3H treats it as a repetitive dive, since the body is offgassing.
Altitude is divided into five ranges, which are influenced by barometric
pressure. That is why the defined altitude ranges overlap on their fringes. If a
mountain lake is reached, the altitude range is indicated at the surface (time
of day display), in the logbook and in the dive planner by a stylised mountain
and the current altitude range. Sea level to an altitude of approximately 1000m (3300ft) is not indicated.
In the following diagram, you can see the approximate breakdown of the altitude ranges:
No-dive
warning
Altitude range 2
Altitude icon
Functions at the surface / Diving in mountain lakes