Deco planner confused diver!

[coops]

Dear all



First of all may I thank anybody that is willing to give up a little of their precious time to put me on a path of success.

Can any body please assist me in better understanding the graphs in Deco planner? I have printed off the Help manual and read it constantly at work :- )
I have also read the papers of additional reading at the end of the Help file!

I put into Deco planner the examples in “Clearing up the confusion about deep stops” by Eric Baker, to see if I could use Deco planners analyze function and see what is going on within each body tissue compartment at a given time to see what is going on and make sense of the graphs both in Eric Bakers comparisons paper and Deco Planner.

Now I’m confused!

I went back to basics in Deco planner and put in a dive of 20meters for 20 minutes on 21% to keep things as simple, as I can to see what is going on in the body compartments relative to times within the dive. This gave me a 1 min stop at 9 & 1 min at six, OK fine; now let’s go to the graphs.

Still confused!

% M (maximum) Value graph for given compartments:

Figures up the sides are?
How do the curves represent a dive?
Only 5 Compartments, Why?
If the dive is to 20 Meters, why starts 1.57% at 30 (is it meters).

Loading Graph:

Why does it go beyond 20 (is it meters)?

Pressure graph:

Why no relationship with time?
Why 1 min at 9 & 1 at 6? (as represented on the graph, can we slide it this way and that as long as there is a gradient)?

M Ratio Graph:

Why 4 Curves only ( are they compartments)?
Numbers up the sides have now changed 0-80?
Pink line starts at 30 + Why?

I wish to become a whiz at using Deco planner, unfortunately these graphs I cannot understand. If they are a pretty number of pages of colored lines that do not mean much then fine, I will consider them no more, however if they are a useful guide I would love to be able to fully exploit them.

If any body could point me in the direction of an idiots guide it would be greatly appreciated.

All the best

Coops

PS. GUE Tec 1 Diver, so not a complete novice on physics side of life (I am more than aware, that I am in the presence of many that frequent this site)!

[coops]

Dear all
To clarify.

The PS. at the bottom may look like I said "I am in the presence of novices that frequent this site", this is obviously not the case (my bad grammar/English). I meant to say, I am a novice in the presence of some divers that frequent this site!

Hey Richard you know me, in my day job I only have to shoot people for a living!

C:) :) PS

[Andreas]

Dear Coops,

I will try to answer your questions below.


I went back to basics in Deco planner and put in a dive of 20meters for 20 minutes on 21% to keep things as simple, as I can to see what is going on in the body compartments relative to times within the dive. This gave me a 1 min stop at 9 & 1 min at six, OK fine; now let’s go to the graphs.

Still confused!

% M (maximum) Value graph for given compartments:

Figures up the sides are?
How do the curves represent a dive?
Only 5 Compartments, Why?
If the dive is to 20 Meters, why starts 1.57% at 30 (is it meters).

The figures up the sides (Y-axis) is the %M-value scale. X-axis represents the 16 tissue compartments, and the percentage values on the x-axis shows the %M-value for that compartment when surfacing ("surface" curve).
The curves are explained on the right side of the graph. In the default setting, the red curve represents Pre-dive, the blue curve represents the start of the 9 meter stop, etc. If you go to the "Graph" menu in DecoPlanner's main window you can also enable "Deco stop end", which will add curves showing the %M-values for the end of each deco stop.
So, this whole graph just shows %M-values, and no depths anywhere.



Loading Graph:

Why does it go beyond 20 (is it meters)?

The unit is MSW Absolute, which is a pressure unit, not depth. If you look at the red curve, which represents the Pre-dive values, you will find that it is almost constant at around 7.8 MSW. This means that your body is saturated with Nitrogen from breathing Air at the surface. Nitrogen in Air is around 78%, which at atmospheric pressure will result in Nitrogen saturation of roughly 7.8 MSW. (Due to water vapor etc the pressure will be slighly less, but in the graph it may not be noticeable.)



Pressure graph:

Why no relationship with time?
Why 1 min at 9 & 1 at 6? (as represented on the graph, can we slide it this way and that as long as there is a gradient)?

Time is implied as the pressure decreases (which of course is the result of your ascent).
The decompression times suggested by the program is a result of the Gradient Factors that you entered, which in this case is 20/85. Viewing the %M Ratios will make this part clearer.
You can also disable the "Last stop at 6M" in the Options menu (useful when you are not using 100% O2 for deco), which will also give you a 3 meter stop.


M Ratio Graph:

Why 4 Curves only ( are they compartments)?
Numbers up the sides have now changed 0-80?
Pink line starts at 30 + Why?

Like in the other graphs, the curves represent the values in question. The X-axis represents the 16 compartments. The Y-axis is the %M Ratios.
The pink curve probably represents the surface values, meaning the %M Ratios (Gradient Factors) that the tissue compartments reach when surfacing.
It sounds like you might find it easier to read the graphs if you switch the Graph Type over from "Line" to "Bar" up in the left corner of the window.

I hope this helps.
Let me know if you have any other questions.

Best,
Andreas Hagberg

[coops]

Andreas,
Thank you very much, I will take your notes in to work with me and have a play around with decoplanner.

Thanks again

C:) :) PS

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