George you asked why. 

My reason is simple. The dive data recorder provides very good statistical
and educational data.

The real time tracking of the dive is of great value for illustrations of
dives 
when teaching. I will put a unit on a new student so i can have a positive
record of gas 
consumption, It also lets us review ascent rates, descent rates, where a
diver has high gas 
consumption and low gas consumption. It's a tool that allows for invisible
data recording. 

Granted, some of the early units had some problems, but those problems are
old and solved. 
Just as you were the one who pushed forward the testing of light and
scooter batteries, I have added
the battery check of this unit too as part of SOP. 

Regards, 

Joel Silverstein 



At 05:43 AM 11/30/99 -0500, kirvine@sa*.ne* wrote:
>Joel, I must have missed something: why would one want to take something
>like this diving with them? I can assure you that anything that would be
>this much of an issue would never be in the water with me, since I have
>no time for bullhsit. I could use the big von method and take an armfull
>of them, but why? I remember Deans dicking around with this crap - it
>really pissed me off to sit there while he had to screw around with
>these things. 
>
>Real presure guage, real bottom timer are the only guages. The rest does
>not belong in the water, and is never found on anyone doing anything
>serious ( and getting it done), and that is no coincidence.
>
>Joel Silverstein wrote:
>> 
>> Billy Deans has used the Nem II and IIa for years, I have used them for
>> years ( i have 4 of them now). Granted some early units had problems, and i
>> had my share of them early one, as have all computers, but these units work
>> quite well. My units have been without problems for over 3 years now once I
>> understood the voltage issue. They eat batteries due to the large amount of
>> data they record but thats not an issue. As long as the voltage is kept at
>> 6.0 v its fine -- when the voltage drops due to leaving the unit on for 2
>> days then you will have a problem. We solved the problem by checking the
>> battery voltage on each power up if its less than 6.0 v we change the
>> batteries ------ the new unit the Gemeni has solved the battery issue, but
>> i have not seen that one yet.
>> 
>> The data recorder is quite a useful tool for teaching and analyzing dives.
>> 
>> Like with all tools they do take a little time to understand their
>> intricacies.
>> 
>> Regards,
>> 
>> JDS
>> 
>> At 05:34 PM 11/29/99 -0800, tgunther@co*.co* wrote:
>> >List:
>> >
>> >I have a Nemiss II+ (as a data logger) and it has worked without fault
for a
>> >year.     I also know many instructors whose Nemesis's have worked for
years
>> >without a hitch.    Perhaps this "Cochrans all suck" should be added to
the
>> >Urban Legends website as often smoke and usually mirrors?
>> >
>> >Tod
>> >
>> >
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>> >
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