Advanced diver deco dives sign off

[Faye Wimpenny]

I am wondering about the requirements for advanced diver decompression dives sign off.

In this situation what would you do?

A person working towards their advanced diver goes on a dive with their computer but when they come back up they say that they have done their planned decompression on tables, even though their computer never went into deco.

Would you sign this off? Opinions any one?

Faye

[steve swift]

I won't sign anyone off unless I know exactly what they are planning to do before, and then someone (ie me or another NQI/ experienced diver) can verify that it was done. I wouldn't just sign something off if they came up after the event and I didn't kow anything about it.

Who is verifying the dive in this case?

Of course, if he did a multi-level dive, his computer might not go into deco, but the same profile on tables could well require deco.

Just my ?0.02 worth
Steve

[edward haynes]

Agree with Steve.

I would be interested in the pre dive planning of the deco.

For Advanced Diver I would expect the requirements on page 358 of the Instructor Manual to be covered, i.e. at least 6 minutes, using an appropriate equipment configuration (for example: planning and using a trapeze) and decompression technique.

HTH

Edward

[janos]

Faye,

It may be worth dropping an email to Mike Clack (MikeC (at) BSAC.com) He'll be able to give you the definitive answer.

Off the top of my head the requirement is for a two-stop dive. Which tables were used? Using 88's this could be (say) a 36 min dive at 30m. For the same dive my computer (Vytec) gives about half an hour of stops! BSAC 88's are quite aggressive tables for a first dive, and it would have to be very much a multi-level dive for my computer to clear on the way up.

I'm a coward, and would not use 88's to plan such a dive, but that is a whole new debate.

Also your computers could well be different to mine (I'm told the Vytec can quite conservative).

Laters,
Janos

PS - Have you asked yout TO ;-)

[PeteM]

Off the top of my head the requirement is for a two-stop dive. Which tables were used?

Off the top of my instructor manual ;-)

"dive involving at least two planned deco stops, of a total of at least 6 minutes, using appropriate equipment configuration and deco technique"

Personally at this level I would want to do the dive with them and make sure they were doing the planning and the dive properly. i.e. good profiles, steady horizontal stops etc.

[janos]

:=Off the top of my head the requirement is for a two-stop dive. Which tables were used?

Off the top of my instructor manual ;-)

Knew someone would have one to hand! The copy I'm borrowing from kind-hearted-Sid is with t'missus at the moment.

Cheers,
Janos

[David Walker]

"dive involving at least two planned deco stops, of a total of at least 6 minutes, using appropriate equipment configuration and deco technique"

One thing the instructor manual isn't too clear on is how the deco needs to be planned? Should it be on tables, even if you use a computer for the dive and just do the deco stops anyway, or using dive planning functions of the computer, or something else?
Most of the AD dives would be done during normal diving, so i'd generally expect that you'd do the stops as you would usually dive, which I suspect very very few use BSAC tables.

I suppose in reality as long as someone can do deco dives safely, then however it's done should be just about OK

David

[nick kay]

Surely one of the most important points, is that the deco is planned, i.e.

1. you have a dive plan, you know you're intending to do deco, you have the necessary equipment prepared (trapeze, stage cylinders, whatever), that the dive marshall knows what is planned, that you have a backup plan in case of equipment/brain failure

2. its not just a case of looking at your dive computer at the end of the dive & having to do what it tells you

[David Walker]

1. you have a dive plan, you know you're intending to do deco, you have the necessary equipment prepared (trapeze, stage cylinders, whatever), that the dive marshall knows what is planned, that you have a backup plan in case of equipment/brain failure

Yeah - that was my way of thinking - you know you're going to deco, you know how long you're going to do deco for (roughly), and obviously have air supplies to do the deco. It was just whether BSAC want you to plan and dive it on their tables - but i'm guessing that's not really the skill you're demonstrating so shouldn't matter.

2. its not just a case of looking at your dive computer at the end of the dive & having to do what it tells you

Yeah

David

[sidlothian]

Knew someone would have one to hand! My copy is with t'missus at the moment.


Oh... _Your_ copy now is it????

sid/

[janos]

Oh... _Your_ copy now is it????

Well possession is 9/10 of the law...

Sorry. Post corrected now. ;-)

Laters,
Janos