Bent. I guess it really can happen to me.

[finnks]

My error. I didn't use the actual PADI table, I used the Dive Planner app on my Android phone. When I installed the app, I checked that it gives the same PGs as the PADI table for the first dive in a series. But apparently the app is more conservative than the PADI table WRT surface time credit, and I hadn't checked that. You were right, I was wrong

But the simulations still hold, though, after I double-checked them. I used Suunto Dive Planner v. 1.0.0.3, bundled with the Suunto Dive Manager v3; Suunto's RBGM algorithm with deep stops. So part of my argument stands: That according to at least one deco model, the OP was closer to the NDL than I'm generally comfortable with.

Actually you were right.

Refer to the image in prior post and go down to the bottom of the table where you find H as the pressure group after surface interval. It is easy to confirm that these letters are the ending pressure groups - simply check what group you are in after a 0:00 surface interval. Using the top values would drop you two pressure groups for popping your head out.

This is why PADI no longer teaches tables. Even experienced-concerned-active divers such as those posting on scubaboard get it wrong. Instructors can spend all of their classroom time on tables without teaching anything else - and students will still get it wrong! End result students with headaches who are so discouraged that they cannot take in any of the other (also important) information. IMNSHO - longer classes are needed so that students can learn more deco theory and develop a feel for NDLs while also learning remaining theory, physical skills and drilling emergency procedures. Good luck selling that!

This is also why boat ops and DMs treat diver as dependents - because most are.

 

[heavierthanlead]

...This is why PADI no longer teaches tables...

Saay whut? :classic:

 

[Storker]

Actually you were right.

Refer to the image in prior post and go down to the bottom of the table where you find H as the pressure group after surface interval. It is easy to confirm that these letters are the ending pressure groups - simply check what group you are in after a 0:00 surface interval. Using the top values would drop you two pressure groups for popping your head out.

*digs out table, refreshes table usage skills*

D'oh! *slaps forehead*

--
Sent from my mobile
Typos are a feature, not a bug

 

[beaverdivers]

*digs out table, refreshes table usage skills*

D'oh! *slaps forehead*

--
Sent from my mobile
Typos are a feature, not a bug

I am franticly searching for mine. Winter is coming. I will need a good ice scraper. The PADI table is the best beacuse of it's size & stiffness.

 

[Storker]

I think people have those subclinical type of symptoms and fatigue frequently and chalk it up to having been "exercising" in the water on a dive.

After reading in "Deco for divers" about the "silent" bubbles, it dawned on me that after I started to be really OCD-ish about safety stops and slow ascents the last two-three meters, I experienced a lot less of the post-dive fatigue/drowsiness I originally assumed was more or less an obligatory consequence of diving. Food for thought, eh?



--
Sent from my mobile
Typos are a feature, not a bug

 

[lowviz]

...//... after I started to be really OCD-ish about safety stops and slow ascents the last two-three meters, I experienced a lot less of the post-dive fatigue/drowsiness I originally assumed was more or less an obligatory consequence of diving. ...//...

Same.

 

[Tigerman]

My error. I didn't use the actual PADI table, I used the Dive Planner app on my Android phone. When I installed the app, I checked that it gives the same PGs as the PADI table for the first dive in a series. But apparently the app is more conservative than the PADI table WRT surface time credit, and I hadn't checked that. You were right, I was wrong

But the simulations still hold, though, after I double-checked them. I used Suunto Dive Planner v. 1.0.0.3, bundled with the Suunto Dive Manager v3; Suunto's RBGM algorithm with deep stops. So part of my argument stands: That according to at least one deco model, the OP was closer to the NDL than I'm generally comfortable with.

The picture was illustrating my brainfart (the opposite way to go on the column). So it was my brainfart that was the error

 

[boulderjohn]

This is why PADI no longer teaches tables.

Saay whut? :classic:

Students have a choice. They can take the class with tables as the means of planning decompression, or they can take the course with computers as the means of planning decompression.

 

[Tigerman]

I hope they cant take the OW course with ANY means of planning decompression

 

[flots am]

I agree. I see it a lot on day boats in CA. Folks get off the boat with a lot of enthusiasm and energy and run their relatively deep profiles up to the limits of their computer, board the boat immediately crawl into a rack and sleep for the rest of the trip. I think people have those subclinical type of symptoms and fatigue frequently and chalk it up to having been "exercising" in the water on a dive.

When I was new, several times I very nearly feel asleep while driving home.

That stopped immediately when I started carefully controlling my buoyancy and workload, doing an extremely slow ascent from 15' and an extended "safety stop," and I switched to Nitrox.

Sorry, I don't remember who recommended the slow ascent here, but "thanks!" whoever you were.

flots.