Bruce

You're probably asking this question on the wrong forum, since the =
concept of "no-deco" dives is not really very techdiver  What you may =
wish to do is obtain some desk-top deco software and try out some =
scenarios.  Try what you may consider a no stop dive at 30m and add 10 =
minutes extra bottom time.  Is the deco significant?  How does it change =
if you go 20 minutes over the no stop time?

How does this relate to the cylinders you carry?  Can you do 20 minutes =
over the no-stop time whilst maintaining sufficient reserve?  If not, =
then you have worked out an upper bound on your BT and the max deco to =
do.  If you dive single cylinders then you'll find that the max deco =
you'll need to do is what we Brits call bugger all.

Try the same scenario with Nitrox.

Dive computers are currently pretty poor at working out deco since their =
algorithm is maximised to avoid litigation.  However, the reality is =
that if you do dives close to the no stop zone, then there isn't too =
much penalty in using them.  The corollary is that there isn't really =
much point in using them as a bottom timer will work just as well.  When =
you get into gradual ascents (multi-level) dives, it gets less straight =
forward, but a little bit of common sense works here too.

One of the key issues with dive computers is that people treat them is a =
reverence that is inappropriate to their status.  Ask yourself how =
comfortable would you be to bail out on your tables if the computer =
fails.  If you claim comfort, then practice bail-out on every dive.  Now =
you'll find that you don't need a computer.  However, if you are not =
comfortable given a computer failure, then you shouldn't be using one in =
the first place since it will fail.

For the dives I do, I usually get out of the water 20-90 minutes before =
those using mixed gas computers or even crazy tables.  Surprisingly, =
there is a lot you can learn on the PC, but for it to be meaningful, you =
have to put it into practice by diving.

Finally, I would caution you about listening to people that have a =
universal table that's always clipped off in their slate pocket (right =
thigh).  Although they may be doing the dives you do, it is likely that =
their experience is limited.

David Shimell

-----Original Message-----
From:	terry michael [SMTP:OEA51@go*.co*]
Sent:	Tuesday, May 22, 2001 6:44 PM
To:	Bruce Sherman; Techdiver List
Subject:	Re: Computor

Bruce, It's all lip service in my opinion, most of the ones with the =
decompression software doing big dives on the computer at home, actually =
show up at the site for the "pussy dives" with no tables and a computer =
and some with just a BT. Next time you're in the water doing a buddy =
check call BU tables and see for yourself. As for me I dive the =
Buehlmann table and it's always clipped off in my slate pocket (right =
thigh). In order to forget it I'd have to forget my drysuit..:-)

-----Original Message-----
From: "Bruce Sherman"<bruce.s@co*.co*.nz*>
To: "Techdiver List"<techdiver@aquanaut.com>
Date: Mon May 21 15:21:15 PDT 2001
Subject: Computor's on dives to max 40mtrs - OK or Laziness ???

>Ok, quick question. Each dive I do or have ever done, in any =
circumstance. Is done using a Uwatec bottom timer and tables (PADI wheel =
for dives less than 40mtrs with no deco) ( Stop Laughing this is a =
serious question) as I thought this was DIR.=20
>
>However I get the feeling that on lots or recreational dives, lots of =
people who dive DIR, use computors due to convienence. And I must admitt =
it would be more simples to use one, BUT I'm quite quick using the wheel =
(stop laughing) to calculate bottom times so there isn't really an =
inconvienence.
>
>SO my question is : Is DIR no computors for anything bar nothing ? and =
if so what tables etc are people using to calculate bottom times on =
casual dives less than 40mtrs (no deco)? or is using a computor on dives =
less than 40mtrs with no deco within the DIR frame ?=20
>Cheers
>Chaz


___________________________________________________
GO.com Mail                                   =20
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