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3. Diving with Galileo
3. Diving with Galileo
41
English
that do require immediate action by the
diver. There are six different alarms:
1.Ascentratealarm
2.ExceedingasafeppO
2
/MOD
3.CNSO
2
=100%
4.Misseddecompressionstop
5.RBT=0minutes
6.Lowbatteryduringthedive
!
WARNING
When in gauge mode, all warnings and all
alarms are OFF aside for the low battery
alarm.
F
NOTE:
- Alarms are both visual and audible,
as described in detail below.
- If you are in COMPASS mode
when an alarm is triggered, Galileo
will revert to the regular computer
display (CLASSIC, LIGHT or
FULL) in order to properly display
the message related to the alarm.
- Ascent rate alarm has priority over
other alarms if they are triggered
simultaneously.
- If warnings are activated while
alarms are showing, the former will
show only after the alarms have
expired and only if they are still
applicable at that time.
3.2.1 Ascent rate
As you ascend during a dive, the pressure
surroundingyoudiminishes.Ifyouascend
tooquickly,theensuingpressurereduction
couldleadtomicrobubbleformation.Ifyou
ascend too slowly, the continued exposure
to high ambient pressure means that you
will continue loading some or all of your
tissues withnitrogen. Consequently, there
is an ideal ascent rate that is slow enough
tominimizemicrobubbleformationyetfast
enoughtominimizetheeffectofcontinued
loading on your tissues.
The pressure reduction that the body can
tolerate without significant microbubble
formation is higher at depth than it is in
the shallows: the key factor is not the
pressure drop by itself, but rather the ratio
of the pressure drop relative to the ambient
pressure. This means that the ideal ascent
rate at depth is higher than it is in the
shallows.
Along these lines, Galileo employs a variable
ideal ascent rate: its value ranges between
7and20m/minandtheactualbreakdown
by depth range is listed in the table below.
depth
(m)
<6 <12 <18 <23 <27 <31
<35 <39 <44 <50 >50
speed
(m/min)
7 8 9 10 11 13
15 17 18 19 20
depth
(ft)
<20 <40 <60 <75 <88<101
<115 <128<144<164>164
speed
(ft/min)
23 26 29 33 36 43
49 56 59 62 66
During an ascent, the nitrogen loading bar
graph is replaced by a graphical ascent
rate indication. The full height of the bar
graph represents twice the ideal ascent
rate, so that when you are ascending at
the ideal ascent rate half of the bar graph
islit. If morethanhalf of thebarislityou
are ascending too fast. In addition, for
CLASSIC and FULL only, Galileo displays
the ascent rate numerically in place of the
temperature.
Ifthe ascent rateisgreaterthan110% of
the ideal value the message ASCENT TOO
FAST! appears.
The following pictures show how the ascent
rate alarm message and the ascent rate
value are displayed for the various screen
configurations.
43


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