Oxygen exposure – SUUNTO Stinger User Manual
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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
2
is used as a default
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 significantly shortened
the OTU monitoring is based on the long-term daily tolerance level and the
recovery rate is reduced.