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Date: Sun, 10 Mar 1996 17:32:19 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: Billy Williams <billyw@oz*.co*.au*>
Cc: Dan Volker <dlv@ga*.ne*>, diveusa@ga*.ne*,
     "George M. Irvine III" ,
     Eric Maiken , Robert Wolov ,
     techdiver@terra.net
Subject: Re: Deep stop procedure question

> Richard,
> 
> How do you account for your slow deep ascent
> and/or  deep  stops  in  your  overall  deco
> management?
> Do you add the longer ascent/deep stop times 
> to  bottom  time  and do the shallower stops
> accordingly? 

My method is to add one to three 2-minute stops between the bottom and 
the first "require" deco stop.  The first of these stops is at half the 
distance from the bottom to the first required stop.  If there is a 
second, it's at half the remaining distance.  If a third, it's again at 
half the remaining distance from the second.

When I first started doing it, I was using an EDGE dive computer on air 
dives, so the computer automatically compensated for the theoretical 
"ongasing" during the deep stops (I had another series of safety factors 
over the remaining decompression time).

When I started doing mixed gas dives, I calculated multi-level tables and 
programmed in the deep stops.

Now with the rebreather, I have real-time computer deco calculations 
again, so the stops are automatically compensated for in the compartment 
model.

> Or do the deep stops help overall offgassing
> to the point where the shallower stops don't 
> need to be extended?

This is probably the case, but I'm not willing to chance it just yet. 
Because of my DCI history, I don't like screwing around with deco, so I
throw in additional safety factors whenever I can.  I generally at 10-60
minutes on the shallow stops over and above what the compartment model
calls for, just as additional safety margin. Since I've started doing the
deep stops, I've backed-off on the extra shallow time, because I feel so 
healthy & alive after the dives.

Aloha,
Rich

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