On page 47 of the manual, for the FO2 default, it says:
"When set ON, 10 minutes on the surface after the dive FO2 is displayed as 50 and further calculations are based on 50% O2 for Oxygen and 21% O2 for Nitrogen (79% Nitrogen) unless you set the FO2 before the dive."
I'm not understanding the "...based on 50% O2 for Oxygen and 21% O2 for Nitrogen (79% Nitrogen)" part... I'm baffled?
"When set ON, 10 minutes on the surface after the dive FO2 is displayed as 50 and further calculations are based on 50% O2 for Oxygen and 21% O2 for Nitrogen (79% Nitrogen) unless you set the FO2 before the dive."
I'm not understanding the "...based on 50% O2 for Oxygen and 21% O2 for Nitrogen (79% Nitrogen)" part... I'm baffled?