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ALADIN SQUARE USER MANUAL
2.2.4 Decompression dives in
mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
4m/13ft stage and a 2m/7ft stage in
altitude ranges 1, 2 and 3.
If atmospheric pressure is below 610mbar
(altitude higher than 4000m/13300ft), no
decompression calculation is carried out
by Square (automatic gauge mode). In
addition, the dive planner is not available in
this altitude class.
2.3 No-dive warning after a dive
If Square detects a situation of increased
risk (due to the potential microbubble
accumulation from previous dives or a CNS
O
2
level above 40%), the NO DIVE symbol
will appear on the display to advise you
against performing another dive right away.
The suggested time interval that you should
wait prior to diving can be checked with planner.
You should not undertake a dive as long
as the no-dive warning is displayed on
the computer screen. If the warning is
prompted by microbubble accumulation
(as opposed to CNS O
2
over 40%) and
you dive anyway, you will have shorter no-
stop times or longer decompression times.
Moreover, the duration of the microbubble
warning at the end of the dive can increase
considerably.
2.4 SOS
If you stay above a depth of 0.8m/3ft for
more than 3 minutes without observing a
prescribed decompression stop, Square
will switch into SOS mode. Once in SOS
mode Square will lock up and will be
inoperable as a dive computer for 24 hours.
If it is used for diving within the 24hours
of an SOS lock, it will automatically
switch to gauge mode and provide no
decompression information.
WARNING
Violating a mandatory decompression obligation
may result in serious injury or death.
Serious injury or death may result if a diver
does not seek immediate treatment should
any signs or symptoms of decompression
sickness occur after a dive.
Do not dive to treat symptoms of decompression
sickness.
Do not dive when the computer is in SOS mode.
The desat display shows the same
information as in presence of desaturation,
but at the bottom right row SOS is blinking.
2.4.1 Desaturation reset
Square allows you to reset the desaturation
in the computer. Any tissue saturation
information from a recent dive will be reset
to zero and the computer treats the next
dive as a non-repetitive dive. This is useful
when the computer is loaned to another
diver who has not diven in the last 48 hours.
Description how to make a desaturation
reset is explained at chapter: Gas settings;
Desaturation reset.
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