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WHILE DIVING
COMPUTER FUNCTIONS
The Giotto computer is turned on by pressing any button and can be set in three diverse modes:
1) AIR DIVE MODE if dives are performed with air and you want to use a decompression computation.
2) NITROX DIVE MODE if dives are performed with Nitrox and you want to use a decompression
computation.
3) GAGE if you do not want to use a decompression calculation but you have the time and depth
indications.
REMARK: The Giotto computer is factory set on the AIR DIVE MODE function for air dives with the PO2
pressure set on 1.4 and the FO2 fraction of the oxygen set on 21%. To set FO2 values different from Air
21% activate the NITROX DIVE MODE.
REMARK: In case the computer does not turn on, this will automatically activate at a depth superior to 1.2
m in a maximum time of 20 seconds.
DIVING WITHIN NO DECOMPRESSION LIMITS
AIR DIVE MODE FUNCTION: Dive with air.
When set in AIR DIVE MODE, during a dive within the no-decompression limits, the display will show the
following information:
1) Current deep value (Depth m.).
2) Non decompression time (No Deco min.).
3) Max depth reached (Max m.).
4) Elapsed dive time (Dive.T min.).
5) Ascent rate indicator.
6) Indicator or altitude level (if set).
7) Current temperature, expressed in ºC or ºF.
Further important information may be obtained by pressing the right (>) button during the dive and
represent:
1) Maximum PO2 set.
2) Oxygen percentage of the selected mixture (Air if FO2=21% and PO2=1.4).
3) Maximum depth which can be reached depending on the maximum PO2 set.
4) The Safety Factor SF.
NITROX DIVE MODE FUNCTION: Dive with Nitrox.
The Giotto computer keeps the setting of the percentage of Oxygen FO2 until the diver manually resets it
to different values or until the DIVE MODE menu is set in AIR. It is important to understand that:
Artificial respiratory mixtures may expose the diver to significant risks, unless they are perfectly known,
analysed and studied in all the aspects related to underwater diving activities. It is mandatory to
understand that THE MIXTURE BEING BREATHED MUST BE EXACTLY EQUAL TO THE ONE SET ON
THE COMPUTER. OTHERWISE, DECOMPRESSION AND TOXICITY INFORMATION provided by the
computer WILL BE DANGEROUS FOR THE LIFE OF THE DIVER Before, after, and during Nitrox dive, it
is mandatory to verify the percentage of Oxygen so that it exactly corresponds to the one in the cylinder.
BEFORE A NITROX DIVE.
The Giotto computer always keeps the AIR DIVE MODE program switched on, until the diver sets it for the
use with Nitrox 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 as long as Giotto
remains set on NITROX MODE. Once the Nitrox program is on, you have to set the exact values of oxygen
percentage (FO2) contained in the cylinder 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.
DANGER: The use of the computer with hyper-oxygenated (nitrox) mixtures is exclusively intended for
divers who have attended a full training course in the use of such mixtures.
DANGER: do not dive with cylinders containing nitrox mixtures whose percentages of oxygen has not
been personally checked.
AIR DIVE
WHILE DIVING WITH NITROX
WHILE DIVING IN ALTITUDE
MODE
LONG
LIGHT
MODE
MODE
LONG
LONG
MODE
LONG
MODE MODE
LONG LONG
INDEX
12
AUTOMATIC
RETURN
AUTOMATIC
RETURN
12


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