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At 01:34 16/06/00 , David Blundell wrote: >I can understand the points being made about the use of computers for deco >diving. > >But tell why I have to buy "bottom timer" when a computer that goes in to gauge >mode when bent works fine. Still displays depth, elapsed time, max depth and so >on. > >Do I really have to buy a official "DIR" approved bottom timer??? > >If your computer works fine in gauge mode, use the bloody thing. > >I've seen plenty of good and practical gear sold because somebody on the net said >you cannot use it. Hi, David. Care to list all this "plenty of good and practical gear"? Thanks rgrds billyw >Deep1dave@ao*.co* wrote: > > > Greeting list, > > > > Lately there has been a lot of posts regarding computers Vs bottom timers for > > deco. I found a good summary that was posted by Jarrod Jablonski last > > February. > > > > I have recently switched to diving with decoplanner tables, and a bottom > > timer. At first, it was awkward to have to look at a table during deco. Now > > I have many of our typical profiles with the appropriate mixes memorized, > > and my deco doesn't depend on a computer. Even if I loose my slate, I can do > > the deco. > > > > During my normoxic trimix class, I dove with both a 2 gas Cochran Commander, > > and a bottom timer with tables. I wanted to see what the Cochran would do > > since it only new about the 50% switch at 70fsw. Well, on shallow dives, say > > to 160fsw for 20min, the cochran would clear at about the time the table had > > me out of the water. However, on the 200fsw for 20min dive, the Cochran > > would bend it self, and lock me out, at the 20fsw stop. In addition, on one > > of the dives, the Cochran really went south and gave me a ceiling of 20fsw > > when I actually hadn't completed my 50fsw stop. That's when I really became > > convinced that we can't safely deco on dive computers. > > > > Deep diving is not a "by the seat of the pants" event. One is forced to plan > > the dive for gas consumption and deco. Understanding and familiarizing your > > self with your deco is just part of it. > > > > Below is the post of Jarrod's. > > > > Hope it helps, > > > > Dave > > > > " 1) Dive computers tend to induce significant levels of diver dependance, > > eliminating the awareness so common and essential to all diving but > > particularly obvious when diving tables > > > > 2) Dive computers do not allow proper planning as divers can't properly > > "study" the impact of various mixture and decompression choices. > > > > 3) Dive computers are of very limited educational benefit as they do not > > induce questioning, or proper planning discussions as can be found with > > tables and most particularly with deco programs > > > > 4) Dive computer programmers often play games with computational process so > > that they can take insulate themselves from the risk of taking largely > > square profile data and utilizing it on a multilevel dive. These games tend > > to result in odd and often ridiculous levels of conservation. > > > > 5) Dive computers are expensive and in some cases leave divers with limited > > resources carrying equipment that is of far less benefit than other > > equipment that may have been purchased. > > > > 6) Dive computers significantly limit the likelihood that divers will track > > their residual nitrogen groups. > > > > 7) Dive computers do not allow for Helium diving in any formats but the > > bulkiest and most questionable format. > > > > 8) Dive computers will often generate longer decompressions than could be > > figured by an astute, well educated diver with experience. > > > > 9) Dive computers often create confusion by giving the user to much useless > > information, sometimes even obscuring depth and time in favor of blinking > > CNS and/or deco limitations. > > > > 10) Dive computers can become very difficult to properly if a deco stop has > > been violated. Some computers lock up completely while others just beep or > > generate erroneous and distracting information. Divers using mixed gasses > > are likely to often violate computer profiles. > > > > 11) Dive computers do not allow for the educated diver to properly modify > > their decompression to account for advancing knowledge such as the use of > > deeper stops in a decompression profile. > > > > 12) Dive computers do not offer divers as much flexibility in the > > generation of profiles with varying conservation. For example the right mix > > would allow 100 min at 60 vs 60 at 60 but I might prefer to do one or the > > other and indeed might like a compromise. Computers confuse this issue by > > not providing divers with the proper information. > > > > 13) Dive computers users often ignore table proficiency and therefore do > > not learn tables properly. When confronted with a situation where they > > can't dive the computer (failure, loss, travel etc) these divers are at a > > serious handicap. > > Jarrod Jablonski > > > > President- > > Global Underwater Explorers www.gue.com > > CEO Extreme Exposure www.extreme-exposure.com > > VP Halcyon Manufacturing www.halcyon.net, www.browniedive.com, > > www.tankfill.com" > > > > Global Underwater Explorers www.gue.com > > GUE is a non-profit educational, research, and exploratory organization > > with hundreds of dedicated members around the world. > > > > Extreme Exposure www.extreme-exposure.com > > Extreme Exposure and Halcyon manufacturing produce some of the scuba > > industries most novel and robust diving equipment designed by many of > > diving's most active explorers. > > -- > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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