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Monster Media 1994 #1
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PERSONAL
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1994-01-14
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Hello fellow divers,
This is version 2.2 of the Nitrogen Absorption Program for DOS, a
program that simulates dives on your PC, enabling you to experiment with
various dive profiles to see how they affect nitrogen absorption. Lest
the personal injury lawyers salivate too much, let me state
unequivocably that NAP is NOT a dive planning device. It is simply
a dive experimenting tool and you should never use NAP as a replacement
for your dive tables.NAP operates a little bit differently than tables,
especially when dealing with repetitive dives, and will give you
different numbers than your tables as a little experimenting will
show.
NAP simulates the absorption of nitrogen by using the well-known
Haldanian model (see "Deeper into Diving" by John Lippmann for the
details). NAP can simulate several tables such as the US Navy tables
and also has a table that is similar to the PADI RDP. (The different
tables can be selected under "Model" in the main menu bar.)
NAP can simulate several dive types- single depth, multiple depth,
and repetitive. Selecting "Repetitive" will allow you to do repetitive,
single depth dives. If you want to do repetitive, multilevel dives,
select "Multi-level" and supply the information for that dive. Unlike
"Single depth" and "Repetive" dives, "Multi-level" does NOT reset the
tissue loading when it is selected, so you can simulate a multi-level
dive, do a surface interval, do another multi-level, ... as many times
as you like. So you must remember to manually clear the tissues if
you want to start a new multi-level dive by selecting "Clear Tissues"
under "File."
NAP has several ways of doing a surface interval. "Real Time" does
exactly that, it computes nitrogen outgassing in real time. "Delta Time"
is like "Real Time" except that it runs at a pace you specify. "Discrete"
allows you to enter a surface interval, and then shows you the tissue
loading at the end of the surface interval.
NAP allows you to work either in feet or meters, by selecting the
desired unit under "Units." Nitrox can also be simulated by choosing
it from the "Gases" menu item.
Pressing F1 causes a simulation to be paused and F2 causes the
simulation to toggle between a fast screen update mode, and one that
runs more slowly so you can watch what happens. The program defaults
to the slower mode on startup. F10 exits the program.
NAP for DOS is a shareware program, so if you use it you should
register it. A version for Windows is also available. There are many
things that I would like to add to NAP such as altitude diving and
decompression calculations, but the rather dismal registration
response for NAP (one in the year or so that NAP has been out) has
pretty much dampened my interest in doing anything else with it.
I really thought that a program like this would be more popular,
and that is why I spent a considerable amount of time writing it.
If you have any comments or questions about NAP, you can reach me at
Dirk Terrell
1010 NW 36th Ave.
Gainesville, FL 32609 (probably will change after summer 1994)
terrell@astro.ufl.edu
d.terrell on GEnie
The registration fee for NAP is $20 U.S.