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From: "Sean T. Stevenson" <ststev@un*.co*>
To: "Kevin Connell" <kevin@nw*.co*>, "Phi Le" <PLe@Se*.co*>
Cc: "TECHDIVER@AQUANAUT.COM" <TECHDIVER@AQUANAUT.COM>
Date: Fri, 08 Jan 1999 15:00:15 -0800
Subject: RE: Nitek3, Nemesis IIa Warts and All
In fact they are not the same, as the computer algorithms seem to be
overly conservative, presumably for liability reasons, and will not
generate the deep stops, so these have to be added manually.  I have a
big problem with blindly accepting ceilings and stop times from an
electronic device in this sort of environment.  Dive computers make it
easier for persons to get in the water without properly planning the
dive, and to wreak havoc on their physiologies with all sorts of weird
sawtooth profiles.  Plus, if you and your buddies do not own the same
model of computer, whose profile do you follow?  There are subtle
differences in the algorithms used in all of these things, and the more
"conservative" it is, the more likely the shape of the curve is
complete nonsense.  Tables can not cease functioning, and so would seem
to be the better alternative.  Admittedly this does take a little more
time and effort, but then this goes back to OW1 - Plan the dive, dive
the plan.

-Sean
DIR(ODDIAA)


On Fri, 08 Jan 1999 13:43:00 -0800, Kevin Connell wrote:

>Phi - They are the same model, but not the same program or environment.
>
>DC's are "real time", and must deal with real world data sampling.
>
>It's quite a bit easier and safer to validate whatever your deco software
>is telling you on your PC rather then just trusting your computer underwater.
>
>Also, I believe (although I don't bother with a second timer myself) that
>the optimal DIR is one bottom timer/depth gauge (pref. uwatec) and one
>wristwatch.  The stopwatch is nice for timing interesting stops that aren't
>on minute boundaries.  (Not that I do that either).
>
>
>At 09:36 AM 1/8/99 -0600, you wrote:
>>Sean,
>>
>>Aren't dive computer and decompression software more or less use practically
>>the same deco model(s) ? On deeper dives, I cut tables too. But I was
>>referring to week-end diving where one doesn't necessary dive deep or on
>>trimix. May be I am off, but trimix is expensive here (Asia) and we don't
>>use it on anything less than 40-50m.
>>
>>Again, I understand your feeling when it comes to certain unreliable
>>computer (i.e. CockRing Nemesis). I did mentioned that my Nemesis IIa die
>>when I still had considerable time left on deco.
>>
>>Just my $0.02 too :-)
>>
>>	Sean wrote:
>>
>>> I do not trust my decompression planning to any computer.  I use a Uwatec
>>> BT and a watch, and cut tables for all dives. Just my $0.02
>>> 
>>> On Fri, 8 Jan 1999 00:26:38 -0600, Phi Le wrote:
>>> 
>>> >Brett,
>>> >
>>> >I agree with you, but I don't think anybody would buy the NiTek3 to use
>>> solely as a bottom timer for trimix dives. It is just an added feature.
>>> You should always have 2 timers anyway. So Uwatec and NiTek3 (in gauge
>>> mode) would do it.
>>> >
>>> >Plus you have a computer for 'everyday' diving. Let's face it, most
>>> people don't do trimix dive every week-end, and certainly most people
>>> don't cut table for every dive. Do you have a computer ?
>>> >
>>> >Phi
>>> 
>>--
>>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
>>Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
>>
>>
>------------------------------------
>Kevin Connell  <kevin@nw*.co*>
>
>NW Labor Systems
>http://www.nwls.com
>
>"I suppose you want a user interface 
>with that.."
>-------------------------------------
>--
>Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
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>


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