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3. Diving with Galileo
- class 1: from approximately
1000m/3300ft to approximately
2000m/6600ft (switch point at
815mbar);
- class 2: from approximately
2000m/6600ft to approximately
3000m/10000ft (switch point at
725mbar);
- class 3: from approximately
3000m/10000ft to approximately
4000m/13300ft (switch point at
610mbar);
- class 4: above approximately
4000m/13300ft. In this altitude class
Galileo functions in gauge mode only
(automatic switch from computer mode).
The altitude classes are defi ned in terms of
approximate elevations because the effect
of weather conditions can make the switch
point pressure occur at different levels.
4000 m
13120ft
2000 m
6560ft
1000 m
3280ft
3000 m
9840ft
0 m
No deco data
gauge mode
Switch point at 610 mbar / 8,85 psi
Switch point at 725 mbar / 10,51 psi
Switch point at 815 mbar / 11,82 psi
Switch point at 905 mbar / 13,82 psi
Galileo deals with altitude automatically: it
monitors the atmospheric pressure every
60 seconds, even when it is turned off, and
if it detects a suffi cient drop in pressure, it
does the following:
- it switches on (if it was off);
- it indicates the new altitude range by
means of black segments inside the
stylized mountain and, if applicable, the
prohibited altitude range;
- it indicates the desaturation time, which
in this case is an adaptation time to
the new ambient pressure. If a dive
is started during this adaptation time,
Galileo considers it a repetitive dive,
since the body has residual nitrogen.
3.6.1 Prohibited altitude
Going to altitude, as much as fl ying after
diving, exposes your body to a reduced
ambient pressure. In a way similar to the
no-fl
y time, Galileo advises you which
altitude classes are safe to reach after a
dive and which aren’t. If you have to drive
over a mountain pass to return home after
a dive, it can be quite important to have this
information.
The prohibited altitude classes are
displayed by grey segments inside the
stylized mountain. This can be combined
with black segments indicating current
altitude. In the example above, the diver is
presently at altitude class 2 and should not
reach altitudes of class 4.
Galileo has an altitude alarm: if you were to
reach an altitude that according to Galileo
is incompatible with your current residual
nitrogen levels, it will warn you with an
altitude alarm (see section 1.4 for more
information).
3.6.2 Decompression dives
in mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
4m/13ft stage and a 2m/7ft stage in altitude
ranges 1, 2 and 3.
If atmospheric pressure is below 610mbar
(altitude higher than 4000m/13300ft), no
decompression calculation is carried out
by Galileo (automatic gauge mode). In
addition, the dive planner is not available in
this altitude class.
Summary of Contents for Galileo sol
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