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From: <NPerry255@ao*.co*>
Date: Fri, 25 May 2001 11:59:54 EDT
Subject: Re: questions about DIR/multilevel dives
To: aldo.solari@ho*.se*, techdiver@aquanaut.com
Aldo, 

Same fundamental approach: cut your tables (e.g., Deco Planner) and plan your 
dives as multilevel, inc. gas and overstay contingencies, then all you need 
is your bottom timer.

Example, when diving the "Roy A. Jodrey," a 640' freighter wreck in the St. 
Lawrence Seaway, which angles sharply down at about 45 degrees, I plan part 
of the dive at 220' - 230'; then multilevel to 180' (where the lower 
wheelhouse is); then finish at 145' (upper part of the wreck).  I calculate 
3-4 different (total) bottom times, possible loss of 50% O2, etc. ~ but 
otherwise it works the same as a single-depth dive: you jump in the water 
with tables and a bottom timer. 

Hope that helps, 

Sincerely, 
Nelson Perry 
------------------------------------------------------------------------------

--------------------------------------------------------- 
In a message dated 5/25/01 11:31:54 AM Eastern Daylight Time, 
aldo.solari@ho*.se* writes:

> Dear  all,  the  "trimix  computer"  and  general  use  of diving
>  computers threads are the background to the following question:
>  
>  - What is or could be a DIR approach to multilevel diving ?
>  
>  Many  dives  (scientific,  exploratory,  recreational)  follow  a
>  multilevel  profile.  Diving in a reef, sampling juvenile fish or
>  other organisms, etc. are necessarily multilevel dives.
>  
>  Your comments will be mostly welcome.
>  
>  Cheers,
>  
>  aldo.solari@ho*.se*
>  www.ccbb.ulpgc.es/fish-ecology/solaris
>  ___

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