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Before I demonstrate a complete lack of knowledge of cave diving =
technique, let me say that this is based on a complete lack of knowledge =
of cave diving other than where you do it.

My question is this.
George, even to someone new to this list, your feelings regarding =
computers are quite clear - they're good for keeping records and as a =
backup to a real depth gauge etc. - no problem with that.

I learnt with the BS-AC and although a lot of people new to the sport =
seem to regard a computer almost as essential equipment - we still learn =
Plan The Dive and Dive The Plan as I'm sure most agencies teach - still =
no problem.

As I understand cavediving, your initial surveys include dye tests so =
you know that any emergence may well be a certain depth below the point =
at which you enter the system.  My first thoughts seem to suggest that =
you could assume a square profile dive at the maximum depth. Restricting =
maybe but safe as far as gas and deco requirements go.  Then it occurred =
to me that some sumps could be below the level of the emergence - is =
this the case? If so then you will not know what your max. depth will =
be, (there would be no point in doing it if you knew exactly what you'd =
find).  How do you cope with this?

Rgds.

Paul Harris

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