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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 signifi cantly shortened
• 
the OTU monitoring is based on the long-term daily tolerance level and 
the recovery rate is reduced.