The Chairman
Chairman of the Board
that affect the ongassing/offgassing of N2. Gas consumption IS one of them, but so are temp, exercise levels, body fat, hydration, yada, yada, yada. Contrary to what was claimed earlier... there is NO consistency between individuals and actual tissue loading of Nitrogen. Unfortunately, our scientists don't always have all of the relationships completely worked out... but they are trying.
No dive computer uses ANY of these variables to alter the schedules programmed into their memory. They only use time/depth as those are the only variables that have been quantified adequately.
Haldane was the first to try do this. There have been many schedules based on his (and subsequent) work. There are other deco models (like RGBM) that have gained a following at one time or another. Computer manufacturers make a decision based on which set of schedules they think is the most accurate. However, most divers base their decision on which computer to buy on everything BUT the type of deco model used. Style and features are the big selling points here, and usually many will try to avoid a model that is known for being "too conservative".
Most modern day tables are variations of the Navy tables (with one or two exceptions). Since these tables were developed around fit male divers with and average age of 18, something had to be done. So, they added @ 10% additional conservatism to the table (some added more) and resulted in very, very few people getting bent when they followed them correctly. Of course, the use of these tables requires only one sample point (the deepest depth) and total time.
"Undeserved hits" occur when individuals have certain variables that are not accommodated by the tables. There is usually more than one variable with (according to Dr Deco) exercising after the dive being the biggest one. A better term would be "Mis-understood hits" as something caused them... it wasn't due to any viciousness on the table's part.
Something not usually pointed out enough, is that there are far more diving accidents involving computers than not. Why? Because they let people to get closer to that mythical "line" in the sand. Most agencies will tell you to do a 5 minute safety stop with a computer, or 3 with a table. This is going with the same reasoning... they are expecting you to ride that computer to the max. Which is never YOUR real max. Yours might be higher or lower depending on all of those variables. Take a page from Hal Watts: "Plan your dive, then dive your plan." Dive conservatively.
No dive computer uses ANY of these variables to alter the schedules programmed into their memory. They only use time/depth as those are the only variables that have been quantified adequately.
Haldane was the first to try do this. There have been many schedules based on his (and subsequent) work. There are other deco models (like RGBM) that have gained a following at one time or another. Computer manufacturers make a decision based on which set of schedules they think is the most accurate. However, most divers base their decision on which computer to buy on everything BUT the type of deco model used. Style and features are the big selling points here, and usually many will try to avoid a model that is known for being "too conservative".
Most modern day tables are variations of the Navy tables (with one or two exceptions). Since these tables were developed around fit male divers with and average age of 18, something had to be done. So, they added @ 10% additional conservatism to the table (some added more) and resulted in very, very few people getting bent when they followed them correctly. Of course, the use of these tables requires only one sample point (the deepest depth) and total time.
"Undeserved hits" occur when individuals have certain variables that are not accommodated by the tables. There is usually more than one variable with (according to Dr Deco) exercising after the dive being the biggest one. A better term would be "Mis-understood hits" as something caused them... it wasn't due to any viciousness on the table's part.
Something not usually pointed out enough, is that there are far more diving accidents involving computers than not. Why? Because they let people to get closer to that mythical "line" in the sand. Most agencies will tell you to do a 5 minute safety stop with a computer, or 3 with a table. This is going with the same reasoning... they are expecting you to ride that computer to the max. Which is never YOUR real max. Yours might be higher or lower depending on all of those variables. Take a page from Hal Watts: "Plan your dive, then dive your plan." Dive conservatively.
