Manos, you need to understand decompression. If you do that you do not need
a computer.
If you are diving a wreck where you know that the depth is between say 60
and 70m you can calculate your approximate average depth with quite good
accuracy, add a few meters to be conservative if you desire. Just monitor
you depth and times at depth carefully during the dive, with some practice
you will get a very accurate average depth.  The BT starts when you hit the
wreck depending on what software you are using.  In Abyss for example you
can set your decent speed and as long as you approximately follow this speed
you can start the BT when you reach the wreck. If you are anal about getting
the deco precisely right (acording to the software) you can take the decent
time from Abbys and use the time as a guide line.  If the decent time is say
3 min, as long as you do not exceed this time you are fine.
Decom on the other hand does not take decent in to account at all but i
still prefer Decom for it's simplicity.  When using Decom i still start the
BT on the wreck if the dive is not very deep because there is so much safety
margin in all the software's anyway.
Finally remember that decompression is not a precise science, the models are
just a best guess.  I do not recommend these techniques to beginners you
need to have your shit together
before trying any of this.  Where i dive the water is very cold so we try to
minimize the deco as much as we can.  If i would use software's at preset
safety values and start the BT on the surface i would not get much diving
done.
 A big draw back with dive computers are that they often are incredibly over
conservative due to liability reasons. I have found almost all computers so
conservative that they are completely useless.

Best,
Ingemar





-----Ursprungligt meddelande-----
Från: S I L E N T I M M E R S I O N [mailto:silent@cu*.ne*]
Skickat: den 11 december 1999 02:20
Till: Manos Manoli; techdiver@aquanaut.com
Ämne: Re: Bootom timer vs multi-gas computer


Manos,

> Do you remember when you bought your first air computer how much
> dive time you gained vs your diving tables. ?
No.

>We are in a similar position now.
No.

> It seams that although bottom timers ( along a pre plan computer
> software )
> work fine with cave divers it simply waisting a lot of dive time on
> dives in
> open sea specially when exploring new areas  where depth varies every
> minute.
Huh? Varies by how much exactly Manos? What kind of dives could you possibly
be talking about?

> ( i still cannot figure it out how can you explore the unknown
>   with a bottom timer, being most of the time much higher than your max
> depth
>    its a rocky multi level rock side here in the Greek Island of
> Cyprus).
Explore the unknown? You have to set a depth for a dive right? You have to
select a gas before you dive right? Or are we talking recreational dives
here? What kind of dives are you making exactly?

>  Thinking of purchasing a multi-gas underwater computer , i wanna her
> some advice , brand , models  from people with  experience using them
The best advice I can give you is to not buy into the computer hype. Learn
decompression diving the right way and use BT with tables only. What level
diver are you? I recommend finding some good instructor that can help you
out here.

Best,

THOMAS



>
> Rgds Manos Manoli.
>
>
>
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