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Sum 52 minutes bottom time
Sum 79 minutes bottom time
Suunto Dive Planner 1.0.0.3
1. 100 feet for 19 minutes
2. 70 feet for 27 minutes
3. 60 feet for 32 minutes
Sum 78 minutes bottom time
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Suunto Dive Planner 1.0.0.3
1. 100 feet for 19 minutes
2. 70 feet for 27 minutes
3. 60 feet for 32 minutes
Sum 78 minutes bottom time
Take two perfectly calibrated reference divers on the same dive, have them spend 3 minutes as SS, and then have one stay there while the other goes up and climbs on board. I am not sure which of them will have "less decompression stress", at that point, or on subsequent dive(s). Some bubble people argue that it's the diver at SS (where on-gassing should be negligible, if any) who has less of it, and their argument does sound plausible to me.
So the Suunto RGBM algorithm is similar to PADI's and very different from the US Navy's. The PADI RDP was designed to make recreational diving possible. Before the PADI RDP, there was pretty much only the US Navy tables. Try to imagine what recreational diving looked like back then. Pretty much all dive algorithms used for recreational computers have the same goal--otherwise they would be out of business. A diver using a computer that followed the US Navy tables would be very unhappy on a 3-tank dive trip.
But let's go back to the original comment to which I was responding. It stated that all dive algorithms were created on the basis of diving done by young, fit males. I simply said different algorithms had different origins. Ironically, if any of them were based on young, fit males, it would be the US Navy tables, and look at those results. The PADI tables were created as a result of studies done on a wide range of civilian divers., not US Navy sailors.
And what is that argument that sounds so plausible?
I can think of one advantage to staying in the water. The purpose of the slow ascent and safety stop is to make sure that your off-gassing tissues have lost enough nitrogen to make it safe for you to go to the surface. If you have not reached that point, you are better off staying in the water a little longer to make sure. Once your body has off-gassed enough to make going to the surface safe, all the advantage goes to the person going to the surface and breathing uncompressed air, not the person staying in the water breathing a higher partial pressure of nitrogen.
As i said earlier, that is not true for technical divers who breathe very low (or even zero) partial pressures of nitrogen during their decompression stops. The longer they breathe that, the better.
This has been tested. Safety stops reduce bubbling after the dive. So the divers doing the SS will have less stress. It isn’t bubble people who argue that, it is people with ultrasound machines. The integral supersaturation argument also says you are better surfacing later.
Some of the testing had slightly deeper stops, but only maybe 12m.
The bloke describing a slow ascent has something he thinks works, whether it does or not who knows, but at that depth it is unlikely to matter much.
These are approximately the same. You go down for a while plus or minus a few minutes, come up for a bit and go down again for a few minutes, etc
If one suddenly had twice the bottom time of another then maybe you could argue this. Really though they are all the same plus or minus little bit at the limits. As you approach the limits the differences start to look large, but that is an illusion as the similarities are behind you.
johndiver999
Contributor
Did you look at the numbers??? They are drastically different!!?? The navy tables would probably give you 20
Min deco for the last dive
Im not sure any more what onservaive means., I see posts syaing you can stgay longer if your set more conservative. more conservative to me means error on the side of safety. so if the real ndl IS 19 ,MINUTES AND My PUTER IS CONSRVATIVE i EXPECT IT TO SAY 18 R 17 MINUTES IS ndl. If you go up when it hits ndl you are in reality going up a minute or so early. under that idea then when you hit 0 you could stay longer. the more conservative eh setting the more it cuts your stay. IE if real ndl was 20 min and you hve 3 steps of conservatism then least (liberal) setting would be actual ndl the mid would be perhaps 18 minutes (2 minutes short. and high conservitive would be 4 minutes short of actual NDL. If we were talking about an electric femce liberal would be wit in 1 inch of the fence and conservative would be 5 feet from the fence. No matter how you look at it if you yo are telling the puter to lie to you but to lie to various degrees on the side of safety.
#45
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IIRC the Navy tables' slowest compartment has a much longer half-time than the PADI RDP, so while they're more liberal for your first dive, they're more conservative for the following dives on the same day.
Which illustrates very well that the rather common question "which computer (i.e. algorithm) is the most liberal" isn't that easy to give a straightforward answer to.
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