SUUNTO MOSQUITO - Manual (Page 38)

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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. 3.14.). 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
calculations 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.
Fig. 3.14. Violated Mandatory
Safety Stop. Downward
pointing arrow and an audible
alarm indicate you should
descend to ceiling zone.