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I'd shorten the bottom time to just under a good breakpoint, like do 18 minutes instead of 20 and so forth, and then I would abbreviate the intermediate stops so that IF something went wrong, like a flooded suit, I would already be up near the oxygen quickly and could do a little of that and get out , taking my chances. What is happening with cold is that your body tries to protect the core and so shunts the blood away form the extremities. This means that you ongas with open vessels and are offgasing with non compliant ones, and this is why you get the skin bends and the paresthesis in these dives . Cold also has been implicated in tox, and as you know, cold has the same effect as narcosis on the judgement and thinking. This kind of diving is best done with a well thought out plan. The Swedes, Brits, Alaskans, are real good at this, and the Missouri guys are good at it for long dives in caves. Check with Jason Weisacosky on long deco in cold water - he is the master. Steve Schultz wrote: > > Hey George, > > How would you adjust the deco if you were diving someplace cold like the > Great Lakes in the spring or fall? > > I'm guessing you'd keep the deep part the same and lengthen the > intermediate stops a little. > > What is the cold physiologically doing to you wrt offgassing? > > ss > > On Mon, 10 Jan 2000 tgunther@co*.co* wrote: > > > JJ: > > > > John has shared a couple of his personal insights below. I would be > > interested in hearing what some of your own general "rules of thumb" might be to > > new users of Deco Planner? > > > > Thanks in advance, > > Tod > > > > ---------------------------------------------------- > > When I started, I was using a low GF of about 20-30% and a high GF of 80-85%. > > ..... I became more comfortable with the plans and discussing it with the others, > > we decided to push the high GF's a little, going up to 90% and we now use 100%. > > The low GF has pretty much stayed at 20% for the more extreme stuff and maybe > > 30% for shallow dives. > > > > A simple rule of thumb to remember about the GF's is that the low GF determines > > where your first deep stop starts - so on more extreme dives, it would be > > prudent to start your stops deeper. The high GF determines how much time you > > spend on your last stop, so a more conservative value will give you longer at > > that stop. The intermediate stops are then interpolated on the GF low-high > > line. > > > > > > -- > > 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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