On 04/08/2014 13:20, Sergey Starosek wrote:
Willem,
Two questions regarding user manual:
1. In "Oxygen management" you use both 1.5 and 1.6 maximum
allowed/deco pO2. Which one is correct? The default is ssrf is 1.6
bar.
2. You reference "mean depth" line in Planner but I don't see one.
Was it copy/paste from profile description? Or did it disappear
like axis guides?
Sergey
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Sergey,
1. This answer is complex. My short response: I propose that this
section of the user manual uses only PO2max of 1.5. Long reponse:
Usually, the Bottom PO2 is 1.4, while the Deco SAC is often 1.5,
although I see that people who do deco with 100% oxygen actually use
PO2(max) = 1.6 (6m max depth). The planner should follow the setup
values under "Gas Options". In other words, if a PO2 for deco has been
set at 1.6, then it should change at deco gas PO2=1.6. If one sets deco
PO2 to 1.5, then it should change at a value of 1.5. However, I must
admit that, with deco PO2 set to 1.6 in a specific dive plan, the
planner on my machine changes to the deco gas at a PO2 of 1.5. The most
parsimonious way to write the manual is to assume that the planner
changes gasses according to the setup values under 'Gas Options'. In the
user manual there was no attempt to recommend any specific PO2 max
value, only to give an indication of what appropriate PO2 max values
could be. After all, this is a topic discussed at length during the
training. The last sentence of the paragraph reads "Normally the planner
decides on switching to a new gas when, during ascent, the partial
pressure of the new gas has decreased to 1.6 bar.". I THINK that this is
what Robert communicated to me at some stage but I am not sure. We need
input from Robert here, especially since some of the user manual for the
planner was written before the finalisation of the planner UI. To be
safe, I would keep all PO2max values in the user manual to 1.5, even if
one can set it higher in the planner setup values.
2. This one is easy. Short reponse: The line for mean depth disappeared
with the redesign of the planner UI, as did the axis guide lines. Long
reponse: Maybe this needs re-negotiation for V4.3 especially since many
dive computers report "Average depth" during and/or after a dive. As far
as I am aware mean depth has no relevance to formal dive planning, but
only for interpreting the dive plan after the fact.
Kind regards,
willem
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