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BEFORE DIVING
SET MODE: Setting of dive mode.
Once switched on, the computer is in PRE DIVE screen mode. The settings for the next dive are displayed
here. The parameters can be changed by repeatedly pressing the right (> to scroll the menu) or left (< to
go back to the menu) key until the screen shows the MODE SET (MODE-S) and setting the AIR or
NITROX mode according to the type of dive you want to perform. Giotto allows, in fact, all types of dives,
Air dive, Nitrox dive, and dives with two different hyper-oxygenated mixtures selected, if previously set, in
any moment of the dive.
MODE-S AIR
In this mode you can dive using only air with partial oxygen pressure set in a standard value of 1.4 bar.
Once you choose this mode, by accessing the next menu DIVE SET (DIVE-S) you will be able to modify
only the Deep Stop, Safety Factor (SF) and Altitude (Alt) settings.
MODE-S NITROX
In the NITROX mode you can dive using one or two hyper-oxygenated mixtures MIX1 and MIX2.
Once this mode is selected, you can access the next menu DIVE SET (DIVE-S) to modify MIX1 for the first
mixture or bottom mixture and then MIX2 for the secondary mixture or decompression respectively.
Mix1 is the main mixture, the one we can use for all type of dives or simply for the descent, deep end and
partial ascent phase and it can be set with values between 21% and 50% with O2 variations of 1%.
Mix2 is the secondary mixture or decompression mixture, the one we can use in the ascent phase where
the stop is carried out and it can be set with values between 21% and 99% with O2 variations of 1%.
To dive with one Nitrox mixture it is enough to set only the parameters of Mix1 and use such mixture during
the whole dive.
To dive with two mixtures, you have to set the parameters for both mixtures (Mix1 and Mix2) taking into
account (as said before) that Mix1 is the bottom mixture and Mix2 is the decompression mixture.
During dive when the depth allows it, you will be able to change the mixture in the mode described in the
"dive with nitrox: gas switching" paragraph.
The other accessible settings in DIVE-S once entered in NITROX mode are:
Mix1 and eventually Mix2 Partial Oxygen Pressure (PO2) setting;
Mix1 and eventually Mix2 Percentage or Fraction of Oxygen (FO2) setting;
Dive safety factor (SF);
Altitude (Alt.);
Deep Stop.
DANGER: Cressi discourages diving with gaseous mixtures other than air without proper training. The use
of “technical” multi-gas mixtures may expose the diver to different risks than those of recreational diving,
including serious physical damages and, in extreme cases, death.
IMPORTANT: If the screen displays the battery icon with a single segment on, the computer MUST NOT
be used. The battery can be replaced by the user, as we shall see in the corresponding chapter
To set the MODE-S NITROX mode, press the central key MODE after having selected the MODE SET
(MODE-S) menu. Therefore, by pressing either the right or left (> or <) key, the flashing word Air shown on
the upper right corner of the display will be replaced with the word NITROX. Then, confirm the value set by
keeping the central key pressed to return to the main menu (after an acoustic signal) and if it is still on, the
computer will shut down. If you do not press the central key Mode as described, the computer will modify
the setting in automatic mode by emitting an acoustic signal to return to the main screen, then, it will
automatically shut down.
MODE MODE MODE MODE
LONG LONG LONG LONG
MODE-S MODE
AUTOMATIC
RETURN OR
WITH LONG
MODE
BUTTON
BEEP
INDEX
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