Dive planner MG, TP and FC

[Willem Ferguson]

On 14/10/2015 16:28, Willem Ferguson wrote:
> On 14/10/2015 16:05, Robert Helling wrote:
>> Hi,
>>
>>> On 14.10.2015, at 15:26, Willem Ferguson 
>>> <willemferguson at zoology.up.ac.za> wrote:
>>>
>>> This is the gas pressure in the cylinder at the start of the ascent
>>> phase? This is a meaningful request but would require another selection
>>> to be made in the planner (gas turn rule). This is something that I use
>>> all the time in dive planning.
>>
>> what would that mean for the planner? Except for recreational mode, 
>> the planner always starts the ascent at the end of the manually 
>> entered waypoints.  Would you want to say something like “go to 80m 
>> and then figure out the pressure at which you have to leave 80m so 
>> you and your buddy make it to the surface with x bars remaining”?
>>
>> Best
>> Robert
>>
>> -- 
> Robert,
>
> Correct.
>
> Of course, actually, I commonly dive 230 bar and start the ascent at 
> around 90-95 bar, using thirds. So the 77 bars accurately constituting 
> a third is really a bare minimum and it is affected by deco 
> obligations.  But a message indicating "Ascent back gas pressure = 90 
> bar, i.e. within rule-of-thirds pressure (77 bar)" would be helpful. 
> It is an additional bit of safety information that checks the accuracy 
> of the deep section of the overall dive planning outside of 
> Subsurface. Does this make any sense?
Of course you can see Ferguson' muddled mind here. In a strict thirds 
approach turning would be at around 140 bars in a cave. Reason for every 
bit of additional safety information from the planner. Fortunately I do 
not put my foot in a cave, otherwise I might consider turning at 90 bar!

> Kind regards,
> willem
>
>
>
> _______________________________________________
> subsurface mailing list
> subsurface at subsurface-divelog.org
> http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.subsurface-divelog.org/pipermail/subsurface/attachments/20151014/2776cab3/attachment.html>