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Mike, this is fine, won't argue with you. I agree certainly for higher up stops that doing 13 minutes vs. 15 minutes at 30 foot really isn't going to matter all that much. Your physical conditioning, hydration, and ascent rate from the bottom probably have more to do with you getting bent then the difference in a few minutes between tables. When I made the statement about the one minute stop being accurate it was really for the deep stop. Maybe when doing a deep stop at 160 foot for a minute doesn't matter if you do 40 seconds vs. 60 seconds. Honestly I don't do too many dives where I have stops at 160 FSW so I guess I don't have the experience to comment. Once I hit the higher stops at <50 I stop being very anal about my stops to the seconds. I agree, the table run times take into consideration your ascent rates. Once at the higher stops lots of time I will switch to my BT since at the longer stops a minute here or there isn't going to really matter too much. Art. -----Original Message----- From: Mike Rodriguez [mailto:mikey@ma*.co*] Sent: Saturday, March 10, 2001 1:13 AM To: Paltz, Art Cc: techdiver@aquanaut.com Subject: RE: Underwater timers. At 07:40 PM 3/9/2001 -0500, Art.Paltz@R2*.CO* wrote: Hello Art, >My feeling is that with all the importance put on deep stops that if you are >going to do them, you need to do them correctly and accurately. If a dive >computer did seconds then we would not have this problem. My philosophy is >that if the table calls for a 1 minute deep stop, you should do exactly >that, 1 minute, no more, no less. Well, I'm going to say one last thing on this topic, then I'm gonna drop it. If you don't believe I'm correct, well, then we'll leave it at that. Before you take my word for any of this, keep in mind that I do decompression dives *every weekend*, usually both days; some of these dives go well beyond 400 feet. And I've *never* been to a recompression chamber. --- Timing deco to the second is *totally* unnecessary. It does nothing whatever to reduce your chances of DCS. In fact, people who do a lot of deco diving can do the deco without tables. I never follow a table (though I carry one) when I dive; instead, I know the run-time from experience and just "fit" a curve to the total run-time. It's all approximate. If you know the run-time, anyone can do this. I assure you nobody needs to time deco stops to the second. Saying something like "The table says one minute, so I'm going to do exactly one minute" would only make sense if you could run a profile on three programs and get the same result each time. The reality is that you'll end up with wildly varying stop times yet all of them get you out of the water unbent. Let me ask you something. Let's say that, for redundancy, you took two tables with you on a dive. The tables were generated using two different programs and therefore have significantly differing stop times. Now, when you get to your 30 foot stop and see one table several minutes different from the other table, which one should you use to time the stop to the second by? Since the tables both get you out of the water unbent and since they differ by several *minutes*, deciding which one you should stick to down to the second is rendered pretty much irrelevant as are the seconds ticking off on your stopwatch. Hope this makes sense... -Mike Rodriguez <mikey@mi*.ne*> http://www.mikey.net/scuba Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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