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BEEP-BEEP
ASCENT RATE
SAFETY STOP
BEEP-BEEP
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CHANGE MIXTURE WHILE DIVING
MIX1 AND MIX2 MIXTURES SETTINGS VISUALISATION WHILE DIVING
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INDEX
14
DIVING WITH TWO MIXTURES: GAS SWITCHING.
BEFORE A GAS SWITCHING DIVE.
The Giotto computer always keeps the AIR DIVE MODE program by default switched on, until the diver
sets it for the use with two mixtures in NITROX DIVE MODE (chapter DIVE SET MODE: Dive parameters
setting). In this case the display will show the Nitrox icon which will stay on during the dive and until Giotto
does not change the setting again. You have to set the exact values of oxygen percentage (FO2)
contained in the cylinders to be used during the dive, after having meticulously analysed its content, so the
computer is able to adapt its computing algorithm to the new parameters.
GAS SWITCHING DURING DIVE
During the ascent, if the computer is set in the NITROX DIVE MODE, the MIX1 icon will flash as soon as it
reaches the maximum operating depth (Mod) of the second mixture MIX2 to warn that form that position of
lower height it will be possible to perform the gas switching. At this point to perform this operation you have
to keep the central button pressed. In this way the word Mix1 will keep on flashing and in the position of
the dive data appear the pressure (PO2) parameters set and the oxygen percentage (FO2) parameters of
Mix1. By pressing the right button, the word Mix2 will appear with the parameters if the second mixture. By
keeping the central button pressed the second mixture Mix2 setting is confirmed. In case the gas switching
is not performed, to stop the flashing of the Mix1 icon, simply press the central button. During dive, the
procedure to visualise the data of the mixture set Mix1 and Mix2 is similar to the one used for gas
switching, i.e. keeping the central button pressed the word Mix1 will flash and the pressure (PO2) and
percentage of oxygen (FO2) of Mix1 parameters set will be displayed. By pressing then the right button,
the word Mix2 will appear with the parameters of the second mixture. Now, pressing the right (>) or left (<)
button the Mix1 data will be displayed.
Remark: The Mix1 main mixture icon will not flash in the cases in which during the descent the maximum
operating depth of the second mixture Mix2 is not exceeded.
DANGER: In case the current depth is greater than the maximum allowable depth of Mix2 the Giotto
computer will not allow the gas switching.
ASCENT RATE.
The ascent rate is shown on the display by an arrow indicator at the centre, operating according to the
table in the figure alongside. If, during surfacing, the maximum allowed ascent rate is exceeded, the
display will show at the same time the word SLOW and three arrows flashing and an alarm will sound.
Under these conditions surfacing must be stopped until the SLOW icon disappears and the display returns
to standard conditions.
DANGER: Surfacing too fast dramatically increases the risk of decompression sickness! Cressi
recommends, at the end of each dive, a safety stop of 3 min at 5-6 metres, which will be assisted by the
computer (see next chapter).
SAFETY STOP
Giotto is programmed to automatically signal a safety stop after each dive at a depth greater than 10 m, as
recommended by the training centres and the most recent studies on diving physiology. This stop should
be carried out at a depth between 5 and 3 metres for 3 minutes.
The stop is indicated by the display with the STOP icon; the display, under this condition, clearly indicates
the duration in minutes of the stop and the depth expressed in metres or feet. The safety stop is not
mandatory, yet it is strongly recommended if, for instance, the maximum ascent rate is repeatedly
exceeded. Cressi always recommends respecting it, in order to avoid safety issues.
REMARK: During the safety stop, the maximum depth can be displayed by pressing the right (>) button.
DANGER: At the end of the safety stop, many divers are used to quickly reach the surface, sometimes
even inflating the BCD. It is a serious mistake which may lead to decompression sickness. The last metres
before surface are, in fact, the most critical and the percentage variations of the pressure are significant.
The last section of the ascent to surface should be covered in no less than a minute.
… 14 …

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