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DIVER ATTENTION SYMBOL – ADVICE TO EXTEND
SURFACE INTERVAL
Some patterns of diving cumulatively add a higher risk of DCI, e.g. dives with
short surface intervals, repetitive dives deeper than earlier ones, multiple ascents,
substantial multiday diving. When this is detected in addition to adapting the
decompression algorithm Suunto RGBM will in some circumstances also advise,
with the Diver Attention Symbol (review chapter 3.2.3.2.) that the diver extend
the surface interval
7.3. OXYGEN EXPOSURE
The oxygen exposure calculations are based on currently accepted exposure time
limit tables and principles. In addition to this the dive computer uses several
methods to conservatively estimate the oxygen exposure. These include for
example:
•
the displayed oxygen exposure calculations are rounded to the next higher
whole percentage value
•
for recreational scuba diving, the recommended upper limit of 1.4 bar
PO
is used as a default
2
•
the CNS% limits up to 1.4 bar are based on 1991 NOAA Diving Manual
limits, but the limits higher than 1.4 bar are signifi cantly shortened
•
the OTU monitoring is based on the long-term daily tolerance level and
the recovery rate is reduced.
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