No, in my opinion, other than in a situation where you have done
inadeqaute deco for the bottom time nad need to conserve oxygen, so go
to ten feet in liu of a short 20 and a get out. Gavin and I did that a
couple of times on syphon dives that got out of hand where we had no
support. In a wreck dive this is a possible scenario for a lot of
reasons that are not even bad planning, but real life. With Bill and I
it was just two nuts with nobody to stop us.

I would do the twenty and then ascend at 1 fpm to the area of about 7
feet instead, and then sit on the surface for a bit.

Sean M. Cary wrote:
> 
> Should you even use the 10' stop?  Errols had told me in an e-mail a long
> time ago to not even use the 10'...since you aren't keeping the PO2 at 1.6
> it wasn't worth it.  I have cut them out since then, and set 20 as the last
> stop depth in ZPlan...
> 
> Sean
> 
> ----- Original Message -----
> From: <kirvine@sa*.ne*>
> To: Gliviak, Jozef <Jozef.Gliviak@co*.co*>
> Cc: 'Shimell, David (shimell)' <shimell@se*.co*>;
> <techdiver@aquanaut.com>
> Sent: Thursday, December 16, 1999 3:46 PM
> Subject: Re: Bottom timer - any recomendations
> 
> > I think David already said this, but the steps are not that precise.
> > Some of our guys use an Ironman watch countdown timer that they set for
> > each step, but we are talking very long steps. I carry one of them just
> > so I do not inadvertanly blow off a 100 minute chunk of deco. I do not
> > set the timer, I just note the time of day.
> >
> > BTW, Smithers Z Plan reruns the whole deco after separately figuring the
> > deep stops and the normal run. I run them separately. This is what is
> > giving you guys the bloated 10 foot stop. I think you can reverse the
> > ten and twenty foot times and treat the ten as an ascent to the surface
> > from 20 evenly in that amount of time. I can say that, but Will will
> > not.
> >
> > Gliviak, Jozef wrote:
> > >
> > > Try Z-plan with WKPP deco stops. They are in seconds.
> > > Or if you would like to know (control) your ascent rate in open water,
> It's
> > > helpfull to have seconds.
> > >
> > > The best I can imagine would have a second timer which you can easily
> reset.
> > > I never heard about such device.
> > >
> > > Regards
> > >
> > > Jozef Gliviak
> > > Slovakia
> > >
> > > -----Original Message-----
> > > From: Shimell, David (shimell) [mailto:shimell@se*.co*]
> > > Sent: Thursday, December 16, 1999 4:54 PM
> > > To: Gliviak, Jozef
> > > Subject: RE: Bottom timer - any recomendations
> > >
> > > Jozef
> > >
> > > Why are you concerned about reading to the second?
> > >
> > > David Shimell
> > > Email: shimell@se*.co* <mailto:shimell@se*.co*>
> > > Project Manager, IBM NUMA-Q, Sequent Computer Systems Limited,
> > > Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF,
> UK
> > > registered in England and Wales under company number: 1999363,
> registered
> > > office as above
> > >
> > > --
> > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> >
> > --
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> 
> --
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