Mandatory Safety Stops - Suunto D4 User Manual

NOTE

5.10.2. Mandatory Safety Stops

When the ascent rate exceeds 10 m/33 ft per minute continuously for more than 5
seconds, the microbubble build-up is predicted to be more than is 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
depends on the severity of the ascent rate excess.
The STOP sign appears in the display and when you reach the depth zone between
6 m and 3 m/20 ft and 10 ft, the CEILING label, ceiling depth, and the calculated Safety
Stop time also appear in the display. You should wait until the Mandatory Safety Stop
warning disappears. The total length of the Mandatory Safety Stop time depends on
the seriousness of the ascent rate violation.
WHEN STOP IS DISPLAYED,
MAKE A RECOMMENDED SAFETY
STOP FOR 3 MINUTES.
The Recommended Safety Stop, as the name implies, is recom-
mended. If it is ignored, there is no penalty applied to the following
surface intervals and dives.
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