Exceeding the NDL during recreation diving

[lowwall]

Some old one button, nitrox Oceanic?

I had one of those fail the same way. Mine was an Oceanic Veo 100NX and it displayed a deco obligation a few minutes into my second dive of the last day of a dive trip.

Luckily I was able to continue the dive because during the surface interval the computer display cycled through the max NDL time at different depths and I had noted what it was for the depth of the site we were diving. Since the elapsed time and depth displayed correctly, I was able to treat it like it was in gauge mode.

 

[Angelo Farina]

I agree completely. It is the casual entry into "light deco" on an NDL dive without preplanning for gas needs that I strongly object to.

No pdf to see.

Sorry for the badly formatted link.
Here the PDF describing Self Rescue Diver program on CMAS web site: Self-Rescue Diver Training Programme
As a CMAS instructor, I must say that for CMAS solo diving is generally a deprecated practice.
This course is not for solo diving, it is for diving safely when, by error, mistake, accident, etc, you loose your buddy and become forcedly "solo".
Hence the focus on "self rescue"...
However, for CMAS it is entirely normal being under deco obligation during rec diving (our mantra is "every dive is a deco dive, so better to train, equip and plan as such").
We discourage the whole concept of ascending when there is a problem, CESA also is a strongly discouraged practice, as we assume that, in general, a direct ascent to surface is way more dangerous than being trained and equipped for solving any problem remaining down.
So, if you loose your buddy during a deco dive, then of course you are a solo diver with deco.

 

[tursiops]

Sorry for the badly formatted link.
Here the PDF describing Self Rescue Diver program on CMAS web site: Self-Rescue Diver Training Programme
As a CMAS instructor, I must say that for CMAS solo diving is generally a deprecated practice.
This course is not for solo diving, it is for diving safely when, by error, mistake, accident, etc, you loose your buddy and become forcedly "solo".
Hence the focus on "self rescue"...
However, for CMAS it is entirely normal being under deco obligation during rec diving (our mantra is "every dive is a deco dive, so better to train, equip and plan as such").
We discourage the whole concept of ascending when there is a problem, CESA also is a strongly discouraged practice, as we assume that, in general, a direct ascent to surface is way more dangerous than being trained and equipped for solving any problem remaining down.
So, if you loose your buddy during a deco dive, then of course you are a solo diver with deco.

I suppose it is unlikely that CMAS will modernize its policies and training and harmonize with the rest of the world.

 

[runsongas]

about as likely as hell freezing over. its a cultural issue that they are too stubborn to change their ways. they are stuck like in the 1990s saying air is still safer than nitrox.

 

[tursiops]

about as likely as hell freezing over. its a cultural issue that they are too stubborn to change their ways. they are stuck like in the 1990s saying air is still safer than nitrox.

....and deep air is just fine.

 

[scubadada]

....and deep air is just fine.

What is deep air?

 

[runsongas]

air all the way down to 66m. tdi extended range on steroids.

 

[Sparksi]

Actually, a PADI Tec 40 cert allows for up to 15 mins of deco on single cylinder back gas, but does require a bailout. So yet another variation.

No, it does not. PADI 40 is 10mins deco with a single deco gas up to 50%, non-accelerated deco. But in no way it certifies to use a single cylinder...

 

[inquis]

No, it does not. PADI 40 is 10mins deco with a single deco gas up to 50%, non-accelerated deco. But in no way it certifies to use a single cylinder...

It was revised in 2023 to 15 minutes with a dedicated deco cylinder or 10 mins on backgas (redundant first/second stages required).

 

[crofrog]

It was revised in 2023 to 15 minutes with a dedicated deco cylinder or 10 mins on backgas (redundant first/second stages required).

What’s their plan for getting to the depth they can use the deco cylinder?