Just a little note from the manuals (to whet your appetite for the manuals and the nitrox class): Remember that with *Suunto* dive computers like the Vyper, you *never* *round* *up*.
When you analyze your nitrox, you'll get a number to the tenth of a percent (something like "31.7"). With Suunto computers, you enter 31.7% as "31", *not* as "32". In nitrox mode, Suunto computers use 100% minus what you entered as the percentage of nitrogen (69% in this case), and they use the number you entered *plus one* as the percentage of oxygen (meaning your 31 is counted as 32% O2).
Yes, that adds up to 101%, but the nitrogen calculations and oxygen calculations are done independently. By doing it this way, Suunto automatically rounds conservatively for both oxygen and nitrogen. If you round up, on the other hand, you'll be overstating the amount of oxygen, but worse, you'll be *understating* the amount of nitrogen.
Of course, if you were using nitrox dive tables, anything from 31% to 33% counts as EAN32, so a difference of half a percent or less isn't going to be too significant. Still, it's always good to use a computer according to its design, and the correct way to use a Suunto computer is to never round up.
I just read through the PDF of the VT3 manual (okay, I skimmed the non-nitrox-related parts), and it says nothing about rounding oxygen fractions. I'll take that to mean that you're supposed to do what you would normally think of doing and round to the nearest percent O2 when using the VT3. That being the case, you may end up entering the same 31.7% oxygen content as "31" on the Vyper and "32" on the VT3. It's no big deal (and you're unlikely to have *precisely* the same O2 percentage in two separate tanks, anyway), but it's fun to know. :biggrin:
)
