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6
6.4 Switching gas mixture during
the dive
During the ascent phase, when you reach
a depth corresponding to the MOD of T2
or TD, Galileo will suggest that you perform
the switch. An audible sequence goes off,
and the message SWITCH TO GAS T2 (or
TD) appears on the display. Simultaneously,
the labels of the left and middle buttons
change to SAVE and
>>, respectively.
You have 30 seconds to respond to this
message, else Galileo will consider that
tank T2 (or TD) never existed and adapts
the decompression schedule accordingly.
You can:
- Press or press and hold SAVE to
confirm the gas switch.
- Press or press and hold >> to choose
the next gas in sequence, after which
you would still have to
press or press
and hold SAVE to confirm the switch.
- Press and hold the right button to
terminate the gas switch procedure
without carrying out any switch.
F
NOTE:
- Start breathing from the tank
with the new gas mixture before
confirming a switch.
- If you choose a different tank than
the one suggested by Galileo, the
MOD alarm may go off and the
decompression schedule may
change.
!
WARNING
Always make sure you are switching to the
intended gas. Failure to do so may result in
serious injury or death.
If you confirm the switch, the message
SWITCH TO GAS T2 (or
TD)
SUCCESSFUL appears on the display for
4 seconds. If you exit without confirming
the switch, the message EXCLUDING
GAS T2 (or TD) appears for 4 seconds.
6.5 Special situations
6.5.1 Switching back to a gas mixture
with lower oxygen concentration
There may be situations in which you
have to switch back to a gas with lower
oxygen concentration than what you are
currently breathing. This can happen for
instance if you want to descend deeper
than the MOD for the current gas, or if for
instance you have run out of gas in TD
during the decompression. At this point
you can manually initiate the gas switch
by pressing and holding the left button.
Galileo will display the message SWITCH
TO GAS T1 (or whichever is next in the
sequence) and its MOD. The left and
middle button labels change to SAVE and
>>, respectively. Use >> to choose the tank
you want to use, then press or press and
hold SAVE to confirm the switch. Galileo
will display the message SWITCH TO GAS
T1 (or T2) SUCCESSFUL and adapt the
decompression schedule accordingly. If you
want to interrupt the gas switch procedure,
press and hold the right button.
6.5.2 Gas switch not carried out at the
planned depth
If you fail to confirm the change of gas mixture
within the 30 seconds of when Galileo
suggested it, the gas mixture in question
is excluded from the decompression
calculation and the decompression
schedule is adapted accordingly.
- If you had programmed 3 gases, you
were on T1 and you did not switch
8


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