planner / VPM-B patches

[Davide DB]

GUE Deco Planner profiles added.

Playing with the program I discovered several UI bugs never solved
during all these years. A clear demonstration of OS model superiority.
Anyway...
I corrected some typos in the spreadsheet.

I'm seeing some great discrepancy on multilevel and repetitive dives.
Really I don't know if it's a DP bug.

My question: does it make sense testing a bounce dive as 10'@100m. I
think it's like play dice. isn't it?

it worth copying here an excerpt of DP user manual about repetitive
dives (I'm under the impression it was very experimental...)

Repetitive Dives

DecoPlanner allows the user to plan repetitive dives over any period.
The theory behind repetitive dives is based on Bühlmann’s pulmonary
shunt model. During a surface interval, gas elimination is delayed due
to the pulmonary shunt mechanism; the gas loading remains higher than
a normal set of calculations would conventionally calculate.
Accordingly, on repetitive profiles, it will mean either less no-stop
time or longer deco time.
DecoPlanner runs gas-loading calculations for all the compartments on
a continuous basis, which may cover days or even weeks! The gas
loading is calculated and updated within a mission and are calculated
according to what the diver is doing (surface interval or diving).
At the end of the first dive of a mission (i.e. after all
decompression), each compartment will have a certain loading of helium
and nitrogen. Generally, after oxygen decompression, the fast
compartments will be completely empty of helium and nitrogen and they
will on-gas with nitrogen during the surface interval! The slowest
compartment, 635 minutes for nitrogen, takes over two and a half days
to completely off-gas, so any repetitive dive will halt that process.
Until a better implementation of the pulmonary shunt model is
developed, DecoPlanner behaves as if the surface interval is at one
metre, breathing 21% (i.e., air), and as such the tissues never clear
completely; once a surface interval of three to four hours is exceeded
the penalty on the subsequent dive is the same whether the diver waits
four or 24 hours.

Repetitive VPM

[Adapted from an original document written by Yount, Maiken, Baker]

At the start of a first dive, if the diver has not been diving for a
few weeks, the radial distribution of gas nuclei or “bubble seeds” in
the body is assumed to be pristine. In other words, the radial
distribution is the same in all tissue compartments and has its
long-term equilibrium values.
During ascent or decompression on the first dive, the supersaturation
gradients in each compartment may be relaxed (increased) by the VPM
dynamic critical volume algorithm to allow Nactual versus Nsafe number
of bubbles to form. This causes dispersion in the radial distribution
of gas nuclei across the various tissue compartments.
To compensate on a repetitive dive, the VPM adjusts the minimum
initial radius of gas nuclei in each compartment by an amount
proportional to the dispersion that took place on the previous dive.