More than "Advanced", but not really "Technical"

[ianr33]

How would 80% change the ascent profile? Just curious...

80% is , and I quote: "in fact totally useless and contraindicated as a
deco gas"

(Number 5 in this list) Baker's Dozen 80/20

This thread is so much fun.

 

[lowviz]

Yet another reason not to use 32% in a pony when diving air. You are not trained to switch unless deco trained

Pony always and evermore = AIR, and you are baiting me again...

---------- Post added January 15th, 2014 at 05:28 PM ----------

OH GOD, now it is the Baker's Dozen! This thread has sunk below my certified depth...

---------- Post added January 15th, 2014 at 05:34 PM ----------

I've been wondering, as a practical matter, if you show up at, say, one of the mid-Atlantic dive ops that caters to mainly experienced but not solely tec divers, and you want to go do one of their typical wreck dives in the manner being discussed here, what kind of reaction are you likely to get with the various combinations of certs being discussed here? Are you likely going to have to do some explaining when they see you with (or you ask them to fill) that EAN50 or whatever?

Complicated. With one or two notable exceptions, the LDS' are only very loosely tied to the boats. If you have an oxygen card there will be no further questions from the shop. mid-Atlantic divers are pretty much 'known' on the boats. "Solid" divers are pretty much left to their own devices, not going any further...

 

[boulderjohn]

80% is , and I quote: "in fact totally useless and contraindicated as a
deco gas"

(Number 5 in this list) Baker's Dozen 80/20

You would have to quote that, wouldn't you?

I haven't read everything GI3 wrote, not even close. Of the things I have read, this one gets my vote as his worst. At least if you read #13, you get a decent taste of his normal argumentative technique.

 

[uncfnp]

80% is , and I quote: "in fact totally useless and contraindicated as a
deco gas"

(Number 5 in this list) Baker's Dozen 80/20

This thread is so much fun.

If I click on that link will my computer explode?

 

[tursiops]

80% is , and I quote: "in fact totally useless and contraindicated as a
deco gas"

(Number 5 in this list) Baker's Dozen 80/20

This thread is so much fun.

Consider the author of your link.
i question much of what you post as being unsafe -- this is ScubaBoard, not a tech forum -- but bringing in the Baker's Dozen is extreme.
I suspect you throw this stuff out there just to have fun and be cool and annoy people, but you might want to consider that many readers will view the material not knowing your tongue is in your cheek.

 

[Lorenzoid]

Complicated. With one or two notable exceptions, the LDS' are only very loosely tied to the boats. If you have an oxygen card there will be no further questions from the shop. mid-Atlantic divers are pretty much 'known' on the boats. "Solid" divers are pretty much left to their own devices, not going any further...

I'm thinking of NC ops that have boats. So you're saying that much of this discussion is moot unless you dive with an operator who knows you? If you show up from out of town, not being a regular with them, what might they say? What do such operators think of you saying "My plan is rec-only ... but in an emergency I plan to switch to a deco gas because I have these tec-rec cert cards"? It seems to me that if you're an unknown to them or don't have a lot of experience, they might frown on that. No? I don't mean to sound skeptical or a PADI basher or anything like that, but if you flash, say, a PADI Tec40 card and TDI Advanced Nitrox card would operators in the mid-Atlantic really just nod and say it's okay with us if you do up to 10 mins. deco and use up to 100% O2 if you wish, since you're trained for that combination? Or are some of these tec-rec cards really not useful on their own but rather mainly serve as a stepping stone for further training?

 

[lowviz]

If I click on that link will my computer explode?

Nah, just your head. GI3 did a lot of pioneering stuff, can't totally dis him. Fun read...

---------- Post added January 15th, 2014 at 07:03 PM ----------

...//... So you're saying that much of this discussion is moot unless you dive with an operator who knows you? If you show up from out of town, not being a regular with them, what might they say? ...//...

Definitely not moot.

What would they say: Yes! A new diver, let's give him/her a bit more attention.

...//...What do such operators think of you saying "My plan is rec-only ... but in an emergency I plan to switch to a deco gas because I have these tec-rec cert cards"? It seems to me that if you're an unknown to them or don't have a lot of experience, they might frown on that. No? I don't mean to sound skeptical or a PADI basher or anything like that, but if you flash, say, a PADI Tec40 card and TDI Advanced Nitrox card would operators in the mid-Atlantic really just nod and say it's okay with us if you do up to 10 mins. deco and use up to 100% O2 if you wish, since you're trained for that combination? Or are some of these tec-rec cards really not useful on their own but rather mainly serve as a stepping stone for further training?

Mostly an informal process, they key off the diver. Sometimes call for cards, mostly inspect gear and ask for your run-time. A question or two to confirm/refute any suspicions and you are good to go. PROVIDED that you are on a dive that is within your capabilities. Start with inshore dives and you will be welcomed...

 

[Basking Ridge Diver]

Compare, these light deco dives (36m / 20min):

With no deco gas (whole dive on air) - 44 minute run-time:

Please show me - I thought I understood NAUI dive tables under Air.
Question? if 36m = 120ft and the dive time is 20 mins - I read the tables as 6 mins for Deco (I round up to 25 mins) why do we go to 44 Mins of Deco?
Any comments would be appreciated.

 

[boulderjohn]

Please show me - I thought I understood NAUI dive tables under Air.
Question? if 36m = 120ft and the dive time is 20 mins - I read the tables as 6 mins for Deco (I round up to 25 mins) why do we go to 44 Mins of Deco?
Any comments would be appreciated.

What you are seeing is the difference among different algorithms each designed to keep you safe. I am reminded of a line from the song "Industrial Disease," by Dire Straits: "Two men say they'er Jesus. One of them must be wrong."

In this case, it seems to be the opposite. Widely different ascent profiles based on widely different approaches to decompression all seem to have similar levels of success.

 

[Basking Ridge Diver]

And so now I am getting to understand the statements of "Art or Sceince"... Thank you