Suunto D9 User Manual page 76

to be understated and will affect decompression calculations. If you want to adjust the
computer to provide more conservative calculations, use the personal adjustment
feature to affect decompression calculations, or reduce the PO setting to affect oxygen
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exposure according to the entered O % and PO values. Calculations based on nitrox
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use result in longer no-decompression times and shallower maximum depths than
diving with air.
As a safety precaution, the oxygen calculations in the computer are made with an
oxygen percentage of 1% + set O % .
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When the dive computer is set in NITROX mode, the Dive Planning mode calculates
using the O % and PO values that are currently in the computer.
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To set the nitrox mixes, refer to Section 5.9.3. Setting the nitrox values.
Default nitrox settings
In NITROX mode, the Suunto D9 allows you to set 1-3 nitrox mixes containing 21-99%
oxygen.
In the NITROX mode, the default setting for MIX1 is standard air (21% O ). It remains
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in this setting until the O % is adjusted to any other percentage of oxygen (22% -
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100%). The default setting for maximum oxygen partial pressure is 1.4 bar, however
you are able to set it in the range of 0.5 - 1.6 bar.
MIX2 and MIX3 are set to OFF by default. To set MIX2 and MIX 3, refer to
Section 6.2.4. Gas change and multiple breathing gas mixes. Oxygen percentages
and maximum oxygen partial pressures for MIX2 and MIX3 are stored permanently.
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