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3.2.2. Mandatory Safety Stop
When the ascent rate exceeds 12 meters/min
[40 ft] momentarily or 10 meters/min [33ft] con-
tinuously the micro-bubble build-up is predicted
to be more than allowed for in the decompres-
sion model. The Suunto RGBM calculation
model responds to this by adding a Mandatory
Safety Stop to the dive. The time of this Manda-
tory Safety Stop will depend on the severity of
the ascent rate excess.
The STOP sign will appear in the display and
when you reach the depth zone between 6 m to
3 m [20 ft to 10] also the CEILING label, ceiling
depth and the calculated Safety Stop time appear
in the display. You should wait until the Mandatory
Safety Stop warning disappears (Fig. 3.14.).
The Mandatory Safety Stop time always in-
cludes the three minute Re commended Safety
Stop time. The total length of the Mandatory
Safety Stop time depends on the seriousness
of the ascent rate violation.
You must not ascend shallower than 3 m [10 ft]
with the Mandatory Safety Stop warning on. If
you ascend above the Mandatory Safety Stop
ceiling, a downward pointing arrow will appear
and a continuous beeping starts (Fig. 3.15.).
You should immediately descend to, or below,
the Mandatory Safety Stop ceiling depth. If you
correct this situation at any time during that dive,
there are no affects on the decompression cal-
culations for future dives.
If you continue to violate the Mandatory Safety
Stop, the tissue calculation model is affected
and the dive computer shortens the available
no-decompression time for your next dive. In
this situation, it is recommended to prolong your
surface interval time before your next dive.
TIME
DIVE
m
NO DEC TIME
T
C
B
MAX
bar
Fig. 3.7. Dive has just begun
and no air time is shown.
First estimate of remaining
air time will be shown after
30-60 seconds.
Fig. 3.8. Diving display. Pres-
ent depth is 19.3 m
[63 ft] and no-decompression
stop time limit is 23 minutes
in A0/P1 mode. Maximum
depth during this dive was
19.8 m [65 ft], elapsed dive
time is 16 minutes.
m
NO DEC TIME
T
C
B
MAX
DIVE TIME
MAX
bar
AIR
TIME
Fig. 3.9. Diving display. Present cylinder pressure is 210 bar [3045 psi]
and remaining air time 41 minutes. Alternative display of current time and
temperature is shown for 5 seconds after pressing TIME button.
m
NO DEC TIME
T
C
B
MAX
DIVE TIME
MAX
bar
AIR
TIME
TIME
°
C