SUUNTO Stinger - Manual (Page 37)

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3.2.1.4.1. RECOMMENDED SAFETY STOP
With every dive over 10 meters the instrument has a three minute countdown for
the recommended safety stop, to be taken in the 3 - 6 meter [10 ft - 20 ft] range. This
is shown with the STOP sign and a three-minute countdown in the center window
instead of the no-decompression time (Fig. 3.12.).
The Recommended Safety Stop, as the name implies, is recommended. If it is ignored,
there is no penalty applied to the following surface intervals and dives.
3.2.1.4.2. MANDATORY SAFETY STOP
When the ascent rate exceeds 12 meters/min [40 ft] momentarily or 10 meters/min
[33ft] continuously the micro-bubble build-up is predicted to be more than allowed
for in the decompression model. The Suunto RGBM calculation model responds to
this by adding a Mandatory Safety Stop to the dive. The time of this Mandatory
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. 3.13.).
The Mandatory Safety Stop time always includes the three minute Recommended
Safety Stop time. The total length of the Mandatory Safety Stop time depends on the
seriousness of the ascent rate violation.