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3. Diving with Galileo
For FULL lay-out, the underlying L0
information is shown immediately upon
pressing MORE. This is displayed instead
of the MB level no-stop or decompression
information and remains there only for
5 seconds, after which it is replaced again
by the information relative to the active
MB level.
NOTE:
The nitrogen bar graph always
references the underlying L0
calculation.
3.5.4 Cascading MB levels
When diving with an MB level, Galileo
carries out all calculations relating to L0 and
to all MB levels in between the currently
active one and L0. This gives the diver the
exibility to start with a given MB level but
to cascade down to a less conservative
level during the dive: if you start the dive
at L4 but decide not to carry out all the
required L4 stops, you can cascade down
through L3, L2, L1 all the way to L0. Only
decompression stops relating to L0 are
mandatory and must be respected at all
times, whereas the level stops calculated
by the MB levels are recommended but not
mandatory. Section 3.5.5 describes how to
cascade to a lower level.
3.5.5 Level stop ignored/MB level
reduced
If a level stop is required and you ascend
1.5m/5ft or more above it, Galileo will
reduce your active MB level to the next one
compatible with the current depth. When
this happens, the new active MB level is
permanently displayed on the screen. It is
no longer possible to fi nish the dive with the
MB level set at the beginning of the dive.
When the level stop depth is the same as
the deco stop depth, ascending 1.5m/5ft
above it will cause Galileo to cascade down
to L0.
At the end of the dive, for fi ve minutes after
reaching the surface, the active (reduced)
MB level is shown on the display. After fi ve
minutes Galileo changes to surface mode
and switches back to the MB level set prior
to the dive, but the reduced MB level is
recorded in the logbook.
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 infl uence on
ongassing and offgassing 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
1000m/3300ft (switch point at
905mbar);
50


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