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I planned a dive to 130 ft for both the sea level dive and altitude dive, because 130' at 6000 ft elevation is roughly equivalent to 160' at sea level. 160' is my limit at sea level, so I changed both dives to 130'. I can't tell you how a dive to 160' at 6000 ft elevation would look like on...

I would never, ever do that. Unfortunately there is no solution to people not using their head, nor a solution to providing them with a brain they don't have in the first place.

To answer your question, no that's not appropriate. If he had depth adjusted prior and decided to forego his adjustment and do a stop randomly at 150' that's definitely not appropriate. It's also not appropriate to execute a dive plan that would leave your buddy on his own at a different...

I wish that were true. Unfortunately most people haven't taken any of the classes, nor dove RD. Anyone who thinks it's just based off of a guess, arrogance, and wishful thinking clearly hasn't taken the classes. Have you? Also, how do you know how much experience I have with RD? How much...

To be fair, that's strictly your opinion. I don't share the same belief as you. You think RD is based on a "guess, arrogance, and wishful thinking," which simply isn't true. No offense, but most of the posts I've seen on here about RD are pretty ignorant. I would respect opinion's about RD...

Interesting, so all of those things your friends miscalculated I use a computer for: average depth, ascent rate, and I run a stop watch on it when I start my ascent. In my opinion, computers/digital bottom timers are much better at this than the brain. However, I always have a pretty good...

Fair enough John. I can say at least now, they don't teach that RD is the same for all altitudes.

What are you asking? Can you post a link? Have I heard of cases where 2 divers using 2 computers got the computer's model calculations wrong? Nope. I have I heard of cases where 2 divers using 2 computers got bent because the model wasn't good enough for the conditions they were in? Yep.

Computationally accurate to their model, but the model may not be accurate, it's a model after all. So yes, I think my brain and my backup brain (my buddy) has more common sense than a computer. It illustrates my point perfectly. Yes, there is no bug in the software, just a bug in common...

Sorry I haven't been able to reply to this thread, was busy not internet diving: It's not taught directly as a part of RD, but it is taught that you shouldn't assume RD works for all altitudes. I've never had the chance or the interest to do any altitude diving, but personally I would look at...

I've taken their Tech 1 program and do deco dives on gauge mode. All the UTD trained divers I know doing tech profiles do the same (also a small sample too, about 8).

Right, the ratio deco 2.0 is the result of the changes that came out of that study and puts the time from the middle of the curve on the shallower side. Take a look a thing the samples profile I posted. As far as altitude diving, it's not built into ratio deco. My instructor told me to look at...

John, altitude not having an effect in decompression is definitely a 180 degree turn from what I've been taught in my time with UTD, for what it's worth. Also regarding S curves, I believe they used to take the stolen time from the middle and equally distribute it to the deeper and shallower...

Ah yes, that study. I think everyone is pretty much in agreement these days that strict VPM isn't so safe. From what I understand, the ratio deco approach maintains some deep stop theory to avoid too large of bubble sizes, much less than a strict VPM. For example, if you shape your O2 window...

You're referring to the Italian study that Sinbad linked to? The net effect of "ratio deco 2.0" was basically shallower deep stops, and as a result less time spent to get to 50% of your max/average depth.

Sorry you had that experience. That's definitely not been my experience. I certainly wouldn't call that the "philosophy of UTD" either.

Hi Sinbad, nice to see you on here again :). I don't believe the results of the Italian study concluded that ratio deco was more dangerous. The proportion of divers experiencing inflammatory markers relative to those who didn't isn't statistically significant. Even if they were, whether the...

I have taken both GUE/F and UTD Essentials of Recreational and in my opinion they are very similar in the curriculum: buoyancy, trim, position, gear configuration, propulsion, SMB deployment, gas theory, gas selection, decompression strategy, decompression profiles, etc. I think the UTD...

Fantastic color, thanks!

Thook you use a red filter with video lights? I thought when you start using video lights it's better to keep the red filter off because the white lighting provides more truer color. I'm really new to video lights though so the only experience I have with it is internet diving.