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Chris, Thanks for taking the time out of your schedule to respond to questions that I posed to you in my last e- mailing requarding nitrox and high altitude diving. I really wanted information based on your personal experience of high altitude diving here in Colorado and not so much as to the end results that your software can and does provide. However since I do not know or understand how your software works -- that is, what model(s) are used to calculate a profile using nitrox for diving at altitude, I thought that you might enlighten me -- so to speak -- on the technique and procedures involved based on methods and calculations that you use in your software as well as how you do it without using Abyss or a dive computer. Besides, my ten day limit ran out and I suppose that if I could get it up and running again, I might be able to guess what is going on. Unfortunately I can't get it to run nor do I feel that I would be comfortable trying to get any answers about altitude diving using nitrox doing it that way. Some how your software has written something somewhere on my hard drive that precludes down loading and re-running Abyss. Anyway, ten days is not enough time for this person to fully appreciate what it has to offer. As I asked in my original e-mail, do you modify the common procedure that is used when diving on air (based on altitude pressure ratios) to calculate theoretical ocean depth when using nitrox to dive at altitude? Asking it that way got me a one word response. Not very satisfying and it didn't expand my knowledge base very much. :)) Let me ask you that queston in a different way. Without using Abyss or a nitrox dive computer, how would you proceed to determine your dive profile using nitrox instead of air at altitude? If using nitrox at high altitude, e.g., 12,000 feet above mean sea level, I would think that the higher partial pressure of oxygen would contribute toward a greater possibility of hypoxia when surfacing relative to using compressed air. What would be other apparent trade- offs of nitrox vs. air at altitude? Advantages? What would be some of the parameters or other considerations that would possibly influence or determine a specific EANx blend to use at altitude? I understand that any response from you and others involves your personal time and effort. I am very grateful to you and to others that do contribute their time and expertise in answering what are possibly questions that are much too basic or that are poorly presented. However, I'll keep trying until I get it right! :) -Joan-
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