Subsurface deco calculations
miika.turkia at gmail.com
Sat Feb 4 03:34:49 PST 2017
My version is 2 weeks old, no internet during the cruise. Indeed the ostc was set to cylinder 1, that was configured as ean32, the only cylinder in use. Are we not getting that info correctly from ostc or are we merging this wrongly? All DCs were set to 32%.
BTW was on liveaboard with no land visits..
> On 4 Feb 2017, at 14.27, Rick Walsh <rickmwalsh at gmail.com> wrote:
>> On 4 February 2017 at 15:53, Miika Turkia <miika at turkia.com> wrote:
>> I cannot currently log into my gmail account due to 2-factor
>> authentication challenges (cannot receive SMS at the moment), so using
>> my private email, with hopefully correct addresses see-and-pasted from
>> my phone :D
>> Anyway, the attached log calculates quite different tissue saturations
>> for different DCs, the worst being with OSTC Sport with shallowest
>> depths by the sensor.
> I hope you had a nice dive with the threshers. If you can have a beer at the Craic House (Evolution) and tell Dannie I say hi.
> I can see why the OSTC Sport is giving greater tissue saturation and deco, and it has nothing to do with how the deco calculations are performed. The problem is that the xml references a cylinder with index 1, but you only have one cylinder defined (index 0), so it looks (without checking the code) like Subsurface is assuming any undefined cylinder contains air.
> The xml entry for the Suunto Vyper Air specifies a change to cylinder 0 (which is EAN32) at the start of the dive on lines 22 and 23:
> <event time='0:00 min' type='25' flags='1' name='gaschange' cylinder='0' o2='32.0%' />
> <event time='0:00 min' type='25' value='32' name='gaschange' cylinder='0' o2='32.0%' />
> The xml entry for the OSTC specifies a change to cylinder 1 on lines 158 and 159
> <event time='0:02 min' type='25' flags='2' name='gaschange' cylinder='1' />
> <event time='0:02 min' type='25' value='32' name='gaschange' cylinder='1' />
> The Suunto Stinger log does not specify a gas change at all, so the default is the only defined cylinder, which contains EAN32.
> Could I guess you had at least two gasses defined in the OSTC that were downloaded, the second (index 1) of which was EAN32? You could have then merged the dives and deleted the unused gas/ses, but the OSTC profile was still referencing cylinder 1.
> Maybe the default assumed value for an unknown cylinder would be cylinder 0, and if no cylinders are defined, THEN default to air.
>> I have set GF 30/75, if that matters.
>> Any idea if this should somehow be expected or bug somewhere?
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