Max CNS%

[olibert]

Hi everyone,

I'm brand new to OSTC and this forum. So please excuse my style if
not adequate... First of all: I am impressed with the way the mk2
v1.80 looks and dives. Wonder why it took me so long to buy this
computer. Nice piece of technology and art...

One question/suggestion:
I realized the CNS% display becomes fixed after 250%. Is that because
we track CNS in a byte?? It would be great if we could increase
this to, say, 999%. I know a fair amount of divers who are used to
high O2 exposures. In the 500-700% range. The issue I see is that
after 250% you don't know where you stand anymore.. am I at 280% or
400% or 900% ? I have seen the VR3 tracking to ~600%. (guess it can
go beyond) If it is a byte issue, would we have a byte to spare??

Thanks for the great work. Keep it up!!
Xavier



NOTE: I don't recommend to anyone to push beyond 100% CNS but I
respect those who do it. We know that 100% is a very modern and
conservative limit, after all.

[Solodiver]

Interesting Point Xavier, didn't recognize this before. I just checked the GF setting, which seems also to be limited to 255%. This might be a similar discussion as with the CNS and although I think there is no real need for a GF above 255% this might be tracked in the same context.

[sailor]

Hi,

250 CNS, that's a lot, you are sure you are not talking about OTUs ???
OTUs can safely add up to 800 but i believe very few will survive more then 250 CNS without a FFM.

Reiner

[heinrichsweikamp]

Hi,

250%CNS seems a lot to me. Can't believe someone survives this without issues...

No, we absolutely don't have to spare single bytes. If >250 is needed, we can add it easily.

Cheers,
Matthias

[olibert]

Hi Guys, thanks for the quick responses! I can tell there's a lot of passionate
divers here...

Well, 250% it seems a lot from today's reasonable point of view. But not long
ago the max PPO2 was 2.2 and the permitted time at PPO2=1.6 was 180 minutes
instead of 45' today. So, back then they had 400% by today's standards. After
some cases of convulsions it was decided to be more conservative and cut times
and PPO2 down. But that was just a measure to improve statistics for a
minority... The team I talked about get regularly exposure to 500-700% by doing
oxy deco stops at 9m (to widely open the oxygen window) and they are fine, so
far. So I'm just arguing that it would be nice to have an accurate CNS%
saturation reading.

INSISTING NOTE: By no means I am encouraging people to exceed the 100% limit. I
am only making the case that some people take calculated risks based on their
experience. For those risk-takers it would be good to have accurate readings in
the computer.

Thanks again & kind regards,
Xavier

ps: can read more about the PPO2 evolution and CNS history here:
http://atlantisdivers.podbean.com/categ ... ba-divers/