Oceanic Watch / Dive Computer GEO - Manual (Page 44)

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Setting FO2 for NORM Nitrox Dives:
For each value of FO2, the Maximum Operating Depth (MOD) that can be
achieved for the PO2 Alarm Set Point limit previously set will be displayed.
When the FO2 50% DEFAULT is set ON and FO2 is set for a numerical value, 10
minutes on the surface after that dive, FO2 will be displayed as 50 and further
dives will be calculated based on 50% O2 for oxygen calculations and 21% O2
for Nitrogen calculations (79% Nitrogen) unless FO2 is set before the dive.
FO2 continues to reset to the FO2 50% DEFAULT after subsequent repetitive dives
until 24 hours elapse after the last dive, or the FO2 50% DEFAULT is set OFF.
When the FO2 50% DEFAULT is set OFF, FO2 will remain set at the last Set Point
selected for that series of repetitive dives.
The default FO2 for each new dive Period (no dive made in 24 hours) is AIR.
When FO2 is set for AIR, the calculations are the same as when it is set to an FO2
of 21%. When FO2 is set to AIR, it remains set for AIR until it is set for a numeri-
cal FO2 value (21 to 50%).
When FO2 is set for AIR, the O2 Bar Graph is not displayed at any time during a
dive or on the surface. PO2 values and/or warnings will not be displayed during
the dive.
FREE Dive nitrogen calculations are based on AIR and not affected by these FO2
Settings.