2.70 bug deco stop

[marcb]

Hi,
I had some strange behaviour of my deco on my ostc 2n. First dive after firmware update I get into deco 1mn/3m which sound normal but then it adds 1mn/6m and 1mn/9m and finally 1mn/9m. All those deco stops disappeared whith a slow ascent but then 3mn/3m finally stayed ?!? I run OC zh-l16 90/110

2nd dive. I decide to simulate 20mn/50m give approx. 4mn/9m and 34mn/6m with a nitrox 30 and a last stop set at 6 meter. Everything went fine until I get into deco. I get over my deco limit, so it turns red to notify and to stop countdown but at the same time it turns into 71mn deco instead of the previous 34mn!!!

Surprised I continue my deco by going a little bit down and after a while I retry the experience to make sure. Again deco turns red and suddenly went to 51mn!!!

Does anyone had the same problem?

By the way I can't get my CF41 normal, it's shows "unused" but with default and value accessible. And that even after downgrading back to 2.50 before updating again !

I'm now worried having an OSTC with "random" deco display...

[Bardass]

never seen this bug with 2.70, on nitrox and trimix dive

how did you set you mix ?
Which is depth for each mix ?

CF41 is unused by 2.70, there is no more icon mix on 2.70

[marcb]

Merci Bardass pour ta réponse!

1st dive
just on air, first and activated gaz.

2nd dive
I had 3 mixes: air, nx30, nx80 depth set to default for each 66m/40m/10m

all activated but I stayed on Nx30 instead of Nx80 that's why I get from 20mn at 6m to 34mn at 6m which is normal.

If CF41 is unusued why can I set a value (Y or N)?

[Bardass]

ok, i'll try tonight
first gaz don't have any depth, set it to 0

CF41 : HW missed to clear this CF, there is no more icon in 2.70

[Bardass]

it's not a bug !!

i'll try to explain my simulation :
mix 1 : air
mix 2 : NX30 to 40m active
mix 3 : Nx80 to 10m active
last stop at 6m
cf55 = 0 (no stop to change mix)

[pre]
Time Depth Gaz TTS Stp12m Stp9m Stp6m Comment
20' 50m Air 22' 3' 13'
21' 39m Nx30 21' 3' 13' Change to Nx30 just before 21'
22' 9m Nx30 19' 1' red 3' 13' new stop at 12m appears for 1'
23' 8m Nx30 36' 4' 30' TTS grows up
24' 9m Nx30 17' 2' 13'
25' 5m Nx30 34' 2' red 30' TTS grows up
desactivate Nx80
26' 9m Nx30 32' 1' 30' TTS change is due to Nx80 mix not used
activate Nx80 and use it
27' 9m Nx80 15' 13'
28' 5m Nx80 14' 12' red
[/pre]

to compute TTS, OSTC use all mix you activated at a depth
if you don't switch to this mix at this depth, OSTC compute a new TTS after some seconds without this mix.

[marcb]

Thanks Bardass for your time!

I know OSTC compute new TTS if I don't switch. That's why I get 34mn at 6m instead of around 20mn with Nx80. I got that change during my first minute at 9m.

But that doesn't explain a totally new and wrong TTS above 5m, so out of my deco stop depth limit ! 71mn for the 1st time and 54 the second time.

Any ideas for the 1st dive and having a deco with 1mn at 3/6 and 9m !?!?