NAUI Nitrox Diver
50 Choosing the Best Nitrox Mix
CHAPTER 4: CHOOSING THE BEST NITROX MIX - KNOWLEDGE REVIEW
1. Historically, there are two standard nitrox mixes, _________% oxygen and _________% oxygen, also
called ____________________ and __________________.
2. The maximum operating depth (MOD) is
______________________________________________________________________.
3. Using the Maximum Operating Depth table, what is the MOD for EAN36 if the PO2 is not to exceed 1.4 ata?
_______________________.
4. To calculate the maximum operating depth for any nitrox mixture, begin by finding ________________
__________________________________________________. Then convert this ________
___________________ to a depth.
5. Oxygen percentages on the OCEANx calculator can be set from _______% to ______%.
6. The “best mix” is the highest _____________________________ that can be used at the planned
dive depth.
7. Using the Oxygen Percentages for Best Mix table, what is the best mix for a 30 msw (100 fsw) dive with
maximum PO2 of 1.4 ata? _____________.
8. To calculate best mix, first convert the target depth into the _________________. Next, determine the
fraction of oxygen in the mixture that will produce
_______________________________________________________.