Suunto SS109544000 Scuba Diving Equipment User Manual


 
Reducing no-decompression stop dive times
Adding Mandatory Safety Stops
Increasing decompression stop times
Advising an extended surface interval (Diver Attention symbol).
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, substan-
tial multiday diving. When this is detected in addition to adapting the decompression
algorithm the Suunto RGBM model will in some circumstances also advise, with the
Diver Attention Symbol (review chapter 3.6) that the diver extend the surface interval.
6.3. 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 upped to the next higher percent-
age 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 above 1.4bar are signicantly shortened
the OTU monitoring is based on the long-term daily tolerance level and the recov-
ery rate is reduced