Controlled Emergency Swim Ascents and Computers . . .

[xiSkiGuy]

So I’m diving with my friend who is an instructor a few weekends ago while he is teaching a class. The only difference in our respective dive profiles, is that I didn’t participate in the controlled emergency swim ascent training. I sat on the bottom at (20ft) while he practiced this move with 4 students. After the class was over, my friend and I dove to 140’ to cut a line that was becoming entanglement problem. We weren’t at that depth for very long, but at his first glance at his computer he was in a deco obligation. My computer indicated that I was nowhere near an obligation.

I realize that this isn’t the best example because we were using different computers (and on a reverse profile), but I’m curious if the 4 controlled emergency swim ascents he performed while I sat at depth earlier that day could have made any difference.

Any thoughts?

 

[cornfed]

I realize that this isn’t the best example because we were using different computers (and on a reverse profile), but I’m curious if the 4 controlled emergency swim ascents he performed while I sat at depth earlier that day could have made any difference.

Suunto computers will do this so I imagine others will too. If you exceed the maximum ascent rate for period of time the Suunto Vyper will give you a "mandatory" safety stop. It's not mandatory like a deco ceiling in that it will lock up your computer if you skip it, but he manual clearly states that skipping it will result in lower NDL times for the next dive.

 

[xiSkiGuy]

Suunto computers will do this so I imagine others will too. If you exceed the maximum ascent rate for period of time the Suunto Vyper will give you a "mandatory" safety stop. It's not mandatory like a deco ceiling in that it will lock up your computer if you skip it, but he manual clearly states that skipping it will result in lower NDL times for the next dive.

Thanks. After reading your post and digging deeper into the "Are Suunto' s Conservative?" thread it appears that you are correct that the rapid swim ascents shortened his NDL.

 

[xiSkiGuy]

Actually it was the "RGBM model: do you get locked out a lot? " thread that had the info about ascent rates affecting NDLs.