Suunto VYTEC DS User Guide

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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.

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.

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.