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>I had this happen to me last December, and yes it is true. I had a valve >down on my primary reg at 80 feet while begining decompression at the end >of a 60 minute dive. When my reg started to shut down I grabbed one of >my partner's backups (air) and we began our ascent. My computer switched >to 100% O2 decompression and I didn't notice until we hit our 30' stop >(which is when I got my valve turned back on and switched to my own >main supply). At 20' I went on O2, but the computer had already cleared >me for a direct ascent. ... >I think it's a darned good reason to plan and execute your >dive on tables. I use my computer as a backup in emergencies (i.e. unplanned >excursions beyond the calculated decompression profiles). > >BTW, I have several dives on this machine and like it *very* much. I would >no longer consider making a technical dive without it. First, thanks for commenting my message. Now, serious stuff: Your conclusion seems to be irrational... you just confirmed earlier that the unit is badly designed and is not reliable and your saying that you would not consider making a technical dive without it. My opinion is that for technical dives, we must use equipment that we are pretty sure will not fail during the dive. In the case of that device, it seems to be obvious that it may fail, most certainly if you have another problem (like the one you mentioned). I do not own a Nemesis computer, but I made dives with computers of that company. One was not functioning in cold water (it was a Sherwood Sentry made by Cochran). I learned later that it was because of the cold water feature of the computer (should I say that the software to disable it was not available). The other one, a Beuchat Maestro Pro (manufactured by Cochran Consulting) was still 10-15 feet off even after being returned several times to the supplier. Finally, the problem was corrected, but I was not able to witness it since the computer did not turn on until the end of my dive! One of my friends confirmed that the depth was reading OK on a later dive. The design of the gas switch feature seems to be completely erroneous... I would not trust that for any of my dives. On the positive side, the Maestro Pro screen layout is fantastic... when its working. The case and the wrist strap seems to be rugged enough. I also like the blue color around the screen '-). Michel Therrien m.therrien@ne*.qc*.ca*
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