Viper Air no-fly time 12 hours short?!

[TWilliams8187]

Greetings,
I'm new to the 'board. Hi. My wife and I are one dive away from our open water c-card. Having fun in our dry suits here in the Puget Sound area.

A question has come up concerning the vastly different no-fly times our computers are showing us. I'm diving an Atomic Cobalt, she's using a Suunto Viper Air. Our no-fly times are exactly 12-hours different (Cobalt says 15 hours, Viper Air says 3).

Now, we found in the Viper Air manual that no-fly times will always be the greater of 12 hours or the desaturation time and that if the desaturation time is less than 70 minutes, no no-fly time is shown. Does that mean that she needs to add 12 hours to any no-fly time displayed?! That's nuts, if that's the case!

Anyway, I'm guessing others have figured this out. We're having a lot of fun; just want to clear up this confusion between our two computers.

Thanks,

--Tracy & Kim

[NJDiverMark]

12+3=15. Makes sense to me.

[TWilliams8187]

Yeah, but what doesn't make sense is for the computer to make me add 12 hours to the no-fly time. What safety value does that have?!

[NJDiverMark]

Maybe once it gets to 12 hours it will say 12 hours. Idk

E.g. 3,2,1,12,11,10,etc

Maybe call the lds where you bought it from or contact the manufacturer for more info. Sorry im no help.

[vladimir]

No-fly times border on the arbitrary. You do not have to add 12 hours to the Vyper's no-fly time. You have interpreted the user manual correctly: it counts down from the greater of desaturation time or 12 hours. It sounds like Atomic is being significantly more conservative, that's all.

[Thalassamania]

There are those who feel that there should be a 12 hr (of more) surface interval before flying, no matter what. There are those who are comfortable with the model computation for an ascent to 8,000 feet ... I am of the latter school, but I often hedge my bet with pure oxygen washout.