Recreational planning with Subsurface?

[Rick Walsh]

On 25 Jan. 2018 8:07 pm, "Willem Ferguson" <willemferguson at zoology.up.ac.za>
wrote:

I am working on the user manual. Because of UI changes, this includes
replacing all the images in the section dealing with the dive planner. I am
trying to get the recreational planner to work and I have a problem. See
attached image.

If the initial cylinder pressure is not set, then the planner provides a
dive at the specified depth and duration is determined by the NDL, limited
by the present cylinder size and initial air pressure. So I select a 12
litre 232 bar cylinder and do not set the initial cylinder pressure.

1) The ceiling and profile do not approach the NDL limits based on dive
tables, even with GF=90/90.


Hi Willem,
In the example you provide, the air NDL at 30m is 13min with gf 35/75. This
looks about right to me. From memory the Buhlmann NDL (gf 100/100) is
~17min, and the PADI and navy tables are 2-3 minutes longer. Reducing the
gf to 35/75 would reduce the NDL.


2) Even more important, at the bottom it says that the dive requires 1245
litres of gas, more than is in the cylinder. But this is wrong because the
12 litre 232 bar cylinder takes 2784 litres.


That looks like a bug. I'm guessing the calculation here assumes the
starting pressure was zero. If you don't enter a starting pressure, the
planner should assume cylinder working pressure.
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