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53
English
GALILEO 2 (G2) USER MANUAL
APNEA
Manually end
the dive session
(at the surface)
-
-
Access alternate
window in
sequence:
Backlight
-
Heart rate
Skin temperature
3 .3 Altitude diving
3 .3 .1
Altitude classes and altitude
warnings after a dive
Climbing to altitude is similar to starting an
ascent from a dive: you expose your body
to a lower partial pressure of nitrogen and
you start off-gassing. After a dive, given the
higher nitrogen loading in your body, even
reaching an otherwise negligible altitude
can potentially cause decompression
sickness. Consequently, the G2 constantly
monitors the ambient pressure and uses it
to evaluate your nitrogen loading and off-
gassing. If the G2 notices a drop in ambient
pressure not compatible with your current
nitrogen loading, it will activate a warning
to alert you of a potentially dangerous
situation.
The G2 counts down remaining
desaturation and indicates this in the
surface mode display until desaturation is
complete.
The allowable altitudes are indicated with the
mountain symbol in the right upper corner
of the time-of-day display. The prohibited
altitudes (which the G2 has computed to
be incompatible with your current nitrogen
saturation levels) are solid color segments
inside the mountain symbol. For more
details, see chapter:
Altitude and the
decompression algorithm.
The current altitude can be checked in the
menu
5. Altimeter
.
The remaining nitrogen loading is shown with
an indicator bar along the right edge of the
display labeled with a description text N
2
.
F
NOTE: The no-fly, no-dive and altitude
restriction symbols are also shown
on the time-of-day display, when
applicable.
3 .3 .2
Altitude and the
decompression algorithm
Atmospheric pressure is a function of
altitude and of weather conditions. This
is an important aspect to consider for
diving, because the atmospheric pressure
surrounding you has an influence on the on-
gassing and off-gassing of nitrogen. Above
a certain altitude, the decompression
algorithm has to change to account for
the effect of the change in atmospheric
pressure.
The G2 divides the possible altitude range
into 5 classes that are illustrated below:
Altitude Class
Elevation Barometric
switch point
Dive computer
mode
Gauge
(no deco data)
Scuba
Scuba
Scuba
Scuba
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