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3. Diving with Galileo
3. Diving with Galileo
3.6 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 inuence on on-
gassingandoff-gassingofnitrogen.Above
a certain altitude, the decompression
algorithm has to change in order to account
for the effect of the change in atmospheric
pressure.
Galileo divides the possible altitude range
in 5 classes:
- class0(notindicatedonthecomputer
display): from sea level to approximately
1,000m/3,300ft(switchpointat
905mbar);
- class1:fromapproximately
1,000m/3,300fttoapproximately
2,000m/6,600ft(switchpointat
815mbar);
- class2:fromapproximately
2,000m/6,600fttoapproximately
3,000m/1,0000ft(switchpointat
725mbar);
- class3:fromapproximately
3,000m/10,000fttoapproximately
4,000m/13,300ft(switchpointat
610mbar);
- class4:aboveapproximately
4,000m/13,300ft.Inthisaltitudeclass
Galileo functions in gauge mode only
(automaticswitchfromcomputer
mode).
The altitude classes are defined 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 sufficient 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 ying after
diving, exposes your body to a reduced
ambient pressure. In a way similar to the
no-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
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