Oceanic ATOM Operating Manual - page 46

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Setting FO2 for Nitrox Dives:

For each value of FO2,  the Maximum Operating Depth (MOD) that can be achieved with

either the default maximum PO2 value of 1.6 ATA, or the PO2 Alarm limit previously set,

will be displayed.

When the FO2 50% DEFAULT is set ON and FO2 GAS 1 is set for a numerical value, 10

minutes on the surface after that dive, the FO2 for GAS 1 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 the FO2 for  GAS 1 is set before the dive.

FO2 for GAS 1 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 turned OFF in

the Set FO2 50% DEFAULT ON/OFF MODE.

When the FO2 50% DEFAULT is set OFF, the ATOM will remain set at the last FO2 GAS 1

Set Points for that series of repetitive dives.

The default FO2 for GAS 1 each new dive period is AIR.

When FO2 for  GAS 1 is set for AIR, the calculations are the same as when it is set to an

FO2 of 21%.  When FO2 for GAS 1 is set to AIR, it remains set for AIR until it is set for a

numerical FO2 value (21 to 50%).

When FO2 is set only to 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.