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Hi,
John Heimann asks;
This book raises a question for me which historians or old-timers on the list
may be able to answer.   Although there were divers going beyond 300 fsw on
air in the 60's and 70's, I can't figure out how they planned their dives.  As
far as I can tell they didn't have access to anything other than Navy tables.
Did they extrapolate stop times from these beyond 300 fsw?
end quote.
Yep, that's what my instructor used to do and that's what he taught us to
do when we did our course.  (that was when your basic scuba course taught
you about such things.  Now people fight about spliting Nitrox courses up
into 18, $400 parts, or only 12)

I can't remember *exactly* how it was done, but remember that the stops don't
get any longer after a while in the USN table.  I *think* it was more or less
that you should stop for a minute or two as far below the first tabled stop
as you had gone below what you had tables for.  (eg 330 fsw dive, deepest
table is for 300.  First stop on the table 80 fsw, your first stop is 110 fsw)
Then you should add the time you spend at your first stop to your bottom time
then look up a table, then add one increment.  (eg bottom time is 10 minutes,
stop time is 3 minutes, add them up = 13 minutes, find from the 300 ft table
that there is a 15 minute shedule, go to the next listed shedule, 20 minutes)
Sounds hairy!  I'm glad things are easier now :)

Cheers Jason :)

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