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JJ

Firstly I would just like to thank you guys for decoplan - got my copy this
week and I'm really pleased with it.  The key factors for me are simplicity,
ease of change of variables and simple range planning.  Keep up the good
work!

1)    Decoplan

Best of all I can now dive with an understanding of how I have set the
safety factor - which leads to my first question.  The first decision is
what gradient to commence using these tables on.  I was thinking about
mailing the list about this when your mail came through viz:

>You should also bear in mind that the profile many of us follow
> would clearly elevate your statistical DCS likelihood. It is common for us
> to surface well above the m-values (ie over 100% of the m-value) for
> several leading compartments. Studies indicate that the 85% range provides
> much better DCS protection.

I had made the initial (blind) decision to run with something like 80 - 85%
while I get comfortable with the tables - can you elaborate on the studies
you refer to?

2)    Gas choices - 330 for 25

Would also like (anybody's) views on gas choices for a wreck dive I am
planning next year - Planned ABT is 25 mins at 100m (330fsw)

My initial thoughts are

Bottom mix    11/65
60m                20/30
30m                36%
12m                70%
6m                   02

Initial logistics thought is to stage O2 on the deco station but to carry
the rest.  In the case of a problem (ie surfacing away from the station)
this allows comfortable completion of deco on the 70% (if the surface
support does not get to me with 02 - unlikely but not impossible).  As
background this is 20 miles offshore in the North Atlantic with a tight
window in strong tidal streams.

I look forward to everybody's comments:-)

Kind regards

Mark Dixon



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