Suunto D4 manual Mandatory Safety Stops

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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.

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.

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