Sender: Mark Wagstaff  Date: 5/7/99 11:51 PM

>I use a Dive Rite Nitek3.  Good computer IF IT IS USED PRIMARILY AS A TIMER
>FOR YOUR TABLES but the decompression info adds a comfort zone (deco
>computer for Nitrox dives only - operates as a timer for Trimix).
>
>One criticism, the screen is a bit small.  One word of advice: changing
>mixes is done by pushing the buttons on the front face.  This works well and
>is vastly superior to the Cochran mechanism.  BUT myself and another user
>have had a couple of occasions when the mix has changed without our
>intervention.  This has been due to the pressure fluctuations of entering
>the water operating the buttons.  Always stop briefly at 3m to check mix
>(and all your other gear).
>
>Note: on the dive I noticed the mix had changed I was could refer to tables
>and used the Nitek as a timer.  The importance of having tables and a back
>up timer cannot be stressed enough.

There are 2 occasions where the mix will change on a NiTek3. The first is 
when you did not set the default mix, it should be the one which comes up 
when you switch to plan mode. The second is when the computer does not 
like your PP02 selection for a particular depth, it will want to change 
back. This is particularly noticeable on the 20' 02 stop.


>I have heard tales of woe of the Cochran.  Batteries being a common fault, a
>friend is on his 6th after it keeps blacking out.  Also, on multiple dives
>they have been showing massive deco penalties that were quite unrealistic.
>I don't think they are reliable enough.
>
>I didn't think the Abyss was released yet?
>
>General question to everyone:  what governs deco computers, software, etc.
>Who validates the algorithm?  Who approves the systems.  Someone has posted
>details of a program he wrote, how was this tested?

As far as I know you have a group of "beta-divers" who take the thing 
down and dive it. I suppose the unit can be put in a dive simulator 
pressure tank. The Nitek is made by Seiko.

Here's a good one. DiveRite called our local dive shop and asked if this 
guy who lives in Richmond had actually bought his computer there. 
Apparently this weasel had sent a letter with his Nitek registration card 
saying that he was diving in Australia and while there a Great White 
shark had bit it right ooff his wrist. He wanted DiveRite to give him a 
free new computer. Turns out that when he was down here he asked to look 
at a nitek and stole the registration card out of the box. What a fucking 
weasel.

 Jim


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