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Mailing List: techdiver

Message Display

> 	If you are a pilot, or enjoy driving, you probably like real analog
> gauges, with big clear needles that move fast, instead of digital displays,
> because you can not only see the reading, (altitude, revs, whatever) but also
> the trend in the reading (the first derivative) and maybe even the
> acceleration of the trend (the second derivative). You don't get this with
> scuba guages, analog or digital. You can't look at them and see how fast you
> are sucking air. You just see psi. With a time remaining calculation, the
> reading involves time and is sort of the first derivative. Not exactly, but if
> you knwo what I mean, then you know what I mean. I particularly like my
> Nemesis, since it will actually show my surface air comsumption rate in
> addition to time remaining. On days when I'm tired or excited, I KNOW I'm
> using air faster than planned and dial in more conservancy right away, while
> there is still a lot to be done about it. More information is better, but you
> have to think about it.

I think the real issue is the graphical display.  In my experience, a 
diver is much more easily scared by a needle pointing way down in the RED 
range on the guage that he is by a little lcd saying 322PSI.  I 
personally believe that this was the cause of two out of air situations 
that I witnessed using air-integrated computers.  As far as more 
information, I agree that they are a good thing:  in addition to a 
mechanical pressure guage.

  Jody Svendsen
  MiG Technologies

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