You should read a book sometime.
Recreational Ascent Rate in the last 15 feet
- Thread starter rsingler
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You should read a book sometime.
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No, if you want to be really, really anal, it's correct. Not every dive is a staged decompression dive, though.
That said, I just hate that cliché and have started saying "staged deco" instead of plain "deco" and "no-stop" instead of "no deco" only to avoid seeing it again.
'The fact is, all dives involve decompression since dissolved nitrogen must be eliminated at the end of the dive, but they do not all require stops. ... We prefer in this report to refer to dives without stops as "no-stop" dives, to avoid the implication that decompression is not involved; it always is.'
You're in good company, pity there's -- evidently -- only a handful of people who ever read this stuff. Oh well, it's only been out for quarter century and six months...
DeepSeaExplorer
Contributor
I read lots of books, thank you.
If I read a dive book that said all dives were deco dives, I would immediately toss it, because getting something so basic wrong is inexcusable.
A deco dive requires decompression. A dive that doesn’t require a mandatory deco stop is not s deco dive.
Don’t spread misinformation...
DeepSeaExplorer
Contributor
Do you agree that a diver can go straight to the surface from a NDL dive without injury, assuming reasonable ascent rate and no breath hold?
What does that tell you? That it was a deco dive?!
The answer is in the definition of the term...
NDL = No *Decompression* Limit!
That’s the threshold. If you’re under the NDL, it is by definition not a deco dive.
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That's great. I can recommend Mark Powell's "Deco for divers". It might give you a bit of perspective on your previous blanket statement.
DeepSeaExplorer
Contributor
Your basic assumption is wrong. On an NDL dive there’s no requirement to reduce or eliminate dissolved nitrogen BEFORE the end of the dive. (Good idea to minimize it, yes.)
It is possible to go from depth straight to the surface, depending on the profile.
It’s normal on a dive to finish off gassing on deck. All dive tables are assuming a certain amount of residual gas when exiting. If they didn’t, the times would be impractical and no one would use them.
The trick is how much off gassing is required in water before exiting.
Hence the invention of the term NDL, AKA No Stop Limit.
DeepSeaExplorer
Contributor
Go get yourself a flux capacitor and a delorean so you can drive back to 1994 and tell it to the authors of DSAT report. You know, the people who brought you PADI tables and wheel and the rest of it.
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Do we know each other?
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