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current selected MB level no-stop time (see
section Diving with MB levels, for more
information on MB level diving). It gives you
the opportunity to start ascending before
incurring a decompression stop or a level
stop obligation.
The M2 emits a sequence of audible beeps
for 12 seconds and the no-stop time will
blink. The blinking will continue until you
ascend sufficiently for the no-stop time
to increase to 6 minutes, or until the M2
enters into decompression.
4.11.3
Entering decompression
The M2 can activate a warning when
the first mandatory decompression stop
appears. This alerts you to the fact that a
direct ascent to the surface is no longer
possible.
When the no-stop time ends and a
mandatory stop is required before reaching
the surface, the M2 emits a sequence of
audible beeps and the DECO STOP symbol
blinks, both for 12 seconds.
4.11.4
MB LEVEL ignored
M2 USER MANUAL
When you have set a MB level higher than
L0 and you reach a depth shallower than
the deepest required MB level stop, this
warning will be activated. The M2 emits
a sequence of audible beeps and the MB
level stop symbol, MB level depth and MB
level time will blink for 12 seconds.
Alarms cannot be turned off because
they represent situations that do require
immediate action by the diver. Alarms are
described in the following sections.
WARNING
- When in GAUGE mode, all warnings and all
alarms are off except for the low battery alarm.
- When the M2 is set to "sound off" all audible
alarms and warnings are switched off.
4.11.5
Ascent rate
As you ascend during a dive, the pressure
surrounding you diminishes. If you ascend
too quickly, the resulting pressure reduction
could lead to microbubble formation. If you
ascend too slowly, the continued exposure
to high ambient pressure means 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 shallow
water. The key factor is not the pressure drop
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 shallow water.
DEPTH
m
ft
0
0
6
20
12
40
18
60
23
75
27
88
31
101
ASC SPEED
m/min
ft/min
7
23
8
26
9
29
10
33
11
36
13
43
15
49
51
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