Riding Blind with your DSMB reel

[The Chairman]

@Remy B. like underwear: it depends. A lot of those DMs have taken the very same courses you have, but they think they are invincible. Denial is not just another river in Egypt. Your safety is your concern. You're going to have to read, train and rely on your experience to decide what's right for you. That's why SB exists, so you can ask questions and garner insight.

 

[kensuf]

The traditional "ratio deco," the one AJ is talking about, is about understanding the relationship between the deco and the depth/time and recognizing the pattern associated with the curve.

This is an over-simplification, but you should be able to run a set of tables and then extrapolate anything you need outside of the schedules via RD. Take your favorite dive planning software and cut a series of tables for 150' with time ranges of 30-50 minutes in 5 minute increments. Do you see a pattern developing there?

Now, without running another table for 55 minutes, try to use the pattern you see in front of your eyes to figure out a 55 minute schedule. Now try a 60 minute schedule.

Now use your dive planner to calculate the 55 and 60 minute schedules. Were you right? If not, why not? If yes, well you just used the traditional RD to extrapolate schedules.

I like to think of this is as a tool in case I've really ****** up bad and need to alter my deco schedule on the fly.

 

[kensuf]

The "feel your deco" RD is horse crap btw.

 

[JohnnyC]

Again, a system that fails because a diver loses track due to narcosis, is a problem with the system.

You do understand that narcosis is NOT a factor here right? Ratio Deco only works within the framework of maintaining shallow END's through the use of standard gases. If you aren't diving standard gases, with appropriate END's, you're unable to dive ratio deco correctly or effectively. You're NOT using the system.

So let's all get on the same page here. You've never trained in Ratio Deco, you have some very glaring misunderstandings about how, why, and where it works, yet you feel the need to tell everyone that it's broken and dangerous? You literally have zero actual knowledge or experience with something that you think you're qualified to give advice about. That's just crazy!!! You should run for office!

 

[PfcAJ]

You do understand that narcosis is NOT a factor here right? Ratio Deco only works within the framework of maintaining shallow END's through the use of standard gases. If you aren't diving standard gases, with appropriate END's, you're unable to dive ratio deco correctly or effectively. You're NOT using the system.

So let's all get on the same page here. You've never trained in Ratio Deco, you have some very glaring misunderstandings about how, why, and where it works, yet you feel the need to tell everyone that it's broken and dangerous? You literally have zero actual knowledge or experience with something that you think you're qualified to give advice about. That's just crazy!!! You should run for office!

But a DAN Dr says so!

Source: Pete

 

[C Dub]

You do understand that narcosis is NOT a factor here right? Ratio Deco only works within the framework of maintaining shallow END's through the use of standard gases. If you aren't diving standard gases, with appropriate END's, you're unable to dive ratio deco correctly or effectively. You're NOT using the system.

So let's all get on the same page here. You've never trained in Ratio Deco, you have some very glaring misunderstandings about how, why, and where it works, yet you feel the need to tell everyone that it's broken and dangerous? You literally have zero actual knowledge or experience with something that you think you're qualified to give advice about. That's just crazy!!! You should run for office!

Hey Pete,

Gotta say that Johnny is spot on.

 

[Macan]

I was under the impression that once your weight in on the SMB, both move at very same axis, I assume you will start at the very end of your line, and use the SMB at that moment as your buoyancy, to not ascent uncontrolled and overrun your Deco stop.

Some screen shots from a video that showed the effects of strong current on a fully inflated DSMB. DSMB was deployed at 10 meters. The 30 meter line on the spool played out completely. The fully inflated DSMB was nearly horizontal.

 

[The Chairman]

You do understand that narcosis is NOT a factor here right? R

It's my humble opinion that you over estimate your tolerance to narcosis and don't understand it's significant
roll in diving accidents including getting bent. Again, denial is not a good strategy for survival.

You've never trained in Ratio Deco,

Again, why should I? You've given no benefits except to your ego. @boulderjohn and I have seen the sad results. Those results have been confirmed by a research scientist who is a doctor working for DAN. Where's the benefit? Getting bent if you "don't understand it" like you think you should doesn't seem to be a big plus. So yeah, I'm more than skeptical. That skepticism has served me well as I now have 47 years of DCS free diving. I've seen no studies that indicate that ratio deco is any more effective than burning incense around a voodoo doll while while praying to Cthulu. Have you? So, with better validated solutions, aka a PDC (Personal Dive Computer) or tables, I see absolutely no reason to fill my mind with ratio deco rubbish. I put it in the same category as cave snorkels and split fins.

 

[Remy B.]

View attachment 388487 View attachment 388488 View attachment 388489

Some screen shots from a video that showed the effects of strong current on a fully inflated DSMB. DSMB was deployed at 10 meters. The 30 meter line on the spool played out completely. The fully inflated DSMB was nearly horizontal.

Impressive, did the current change during the dive of they enter the water knowing it was that strong ?, how big is the SMB?

In the Tec dive I did recently here in Curacao we had to Deco in the Current, we didn't deploy the SMB ( it was not planned ), we drift Deco until reaching the plateau where there was no current, of course the current was nothing like in the pictures, I don't know how it can be measured, but it was like fining hard and staying in the same position, that is why we missed our target when we plunged from the boat.

 

[The Chairman]

It looks like a cross current at depth. Surface current is going one way while another current is heading elsewhere at a deeper level. Currents are almost always faster on the surface so there is some of this happening the deeper you go. But the one picture looks like the line is lower for a bit, so I'm thinking opposing currents.