Re: Suunto Vitek Ascent rates

rmacrae wrote:
Hello Blah,
No this is an old Vitek and it doesn't have deep stop mode. When I left the bottom it told me my cielling was 3M, nothing before that.
I was on 30% nitrox, the max for that depth.


Ron.

Therein lies your problem - my Suunto simulation for 30% shows a max depth of 38.6m , and a total dive time with deco of 51 minutes on a Vytec, so you missed some(lots) deco (assuming you did 29,5,3). you should have done 29,5,16 according to the simulator.

Interestingly if you'd come straight up 34m>6m in a minute, the simulation says - 29.1,7 - ie a total dive time of 37 as opposed to 50!.
The slow ascent is walloping you by adding nitrogen.

Hmm.

Have you got Suunto Dive Manager? is your email addy right?









Ron MacRae wrote:

I did a dive at the weekend on the Frognor, which is about 35m.
After 29 minutes, and with 10 minutes required to reach the surface,
my buddy and I set off from 34m. It took us 5 mins to reach 6m, which
works out at an ascent rate of less than 6M/min. Looking at the
profile on my PC the ascent is as close to a continuous line as you
could hope to see, yet I ended up with 3 SLOWs indicating I was
ascending too fast during that phase of the dive.

What sort of ascent rate does the Vitek use?
BSAC recommend 15M/min max and we were well below that, possibly too
far below that if we'd had a serious deco obligation.
The computer is not on the arm that I use to vent air from suit or BC
and I have no recollction of having had to move my arm to any extent,
my buddy was working the DSMB I was just floating.

I've had SLOWs in the past in situations where something happened and
they were deserved but in this case the ascent was completely
uneventfull.

Why would I get slow warnings from the computer in this situation?

Just curious.

Ron.

Have you got it in RGBM mode? (Reduced Gradient Bubble Mode) see
http://www.dive-tech.co.uk/resources/suunto-rgbm.pdf
or deep stop mode?
Dont claim to understand it, but it makes you do deeper safety stops
and
more of them, rather than one final stop.
One example is that for a dive to 34 is that you should stop at 17m,
then at 8, then at 5.
Thus is that mode you would have broken the first stop and the second.
Also, assuming it recalculated after the first miss, you probably
missed another stop somewhere.

Actually, by all ways of looking at it - you should be bubbled up or
dead!

By the PADI rdp on air you had about 10 mins bottom time without deco.

Doing a simulation on a Suunto D9 on air
Can't!
So you must have use 35% Nitrox?
Using 34% Nitrox (max depth 36) you needed 10 mins to surface
but by the time you reached 6m, you still needed 7m safety stop at 5m.
And RGBM mode is SELECTABLE for air, seems to be compulsory for Nitrox
in that you can't seem to turn it off.



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