SUUNTO D9 - Manual (Page 43)

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5.1.5. SAFETY STOPS
Safety stops are widely considered “good diving practice” for
recreational diving and are an integral part of most dive tab-
les. Reasons to perform a safety stop include a reduction in
sub clinical DCI, microbubble reduction, ascent control, and
orientation before surfacing.
The D9 displays two different types of safety stops: Recom-
mended Safety Stop and Mandatory Safety Stop.
Recommended Safety Stop
With every dive over 10 meters there is a three minute count-
down 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. 6.7.).
The Recommended Safety Stop, as the name implies, is re-
commended. If it is ignored, there is no penalty applied to the
following surface intervals and dives.
Mandatory Safety Stop
When the ascent rate exceeds 12 meters/min [40 ft] momen-
tarily or 10 meters/min [33ft] continuously the micro-bubble
build-up is predicted to be more than allowed for in the de-
Fig. 5.11. Setting Dive Ti-
me Alarm. Press up/down
buttons to change alarm on/
off and to set dive time va-
lue. Press Select to accept/
move to next setting.
Fig. 5.12. Entering Nitrox
settings