Cherry picking the best bits.....

[Conor]

Serious ouch!

Its like the ripple effect; the bigger the initial event the bigger the waves, the further out they go the bigger the circumference but the smaller the height.

[peterdevlin]

Originally Posted by chrisch

I often wonder about this one too...

(Why not 100% and do the last stop at 4.5m if there is a swell......)

Chris

... not a bad idea

Thanks

[peterdevlin]

Originally Posted by NotDeadYet

I've always used 100% in the sea. Never had a problem. In fact, I don't think I've ever heard of anyone having a problem doing 100% in the sea. Very quick dips aren't going to do any harm.

Cheers, Stuart.

[Martin Burnard]

I went to cherry pick DIR and fell in the bloody barrel of cherries!

So fundies under the belt, I am about to side step to get a view from outside (TDI), I suspect I will topple back into the cherry barrel afterwards.

No bad thing though, have those around me noticed the difference in my diving.. Yes. So it was good.

Cost? How much would my young daughter and wife miss me?
How do I afford it? Hardly touch alchol, don't smoke, ride the old mountain bike more instead of taking the car, spend time with the family cooking a curry rather than ringing the take-away etc.

I love my diving and love my family.

I live a healthy lifestyle as requested in GUE standards BUT not because they say so, but because that way I can afford my diving.... somehow there appears to be some irony in that!


BASTARDS THEY GOT ME!!!!!!!!!!!!!!

[Lou]

The points that not much in the DIR standards was invented by DIR may be true - but as I said earlier, the point about cherry-picking is that the DIR standards are all pretty accessible, whereas it is alot harder to determine what is commonly used outside of DIR. This partly because you would need access to "long-time divers", partly because you then have to figure out what they have made up themselves, or what is used elsewhere, and partly because no-one else can agree and the detail gets lost in the debate.

[Brian of Aquanauts]

Originally Posted by Bob Cooper

Yes, you will!

Next time you are at 6m in a choppy sea, see what happens to your spool or reel when you let go of it. It goes up and down because it has very little inertia. You, on the other hand, will be slow to respond to the changes in level due to the wave action and will effectively remain at 6m.

I'm with Bob on this one, if you are neutral and are not hanging on to your reel/smb you can hold a perfect 6m stop. I know I am not going deeper or shallower as I'm hovering with my computer in front of me on my wrist, and the display is not changing. We did this on the recent tech 2 course, one of the team got seasick during the stop but hey ho, it was quite lumpy and we were moving up and down a bit but didn't change depth/pressure by more than 30cm.

[Martin Burnard]

I guess breathing is still required at tech 2 then.... it must be Tech 3 where they don't allow it!

(or is that just another fallacy surrounding DIR?).

[Clare Gledhill]

Originally Posted by JAG

As far as I have been told in the past the team don't need to each carry a spare mask, a spare smb, etc.. so long as there is redundancy within the team. Garf kicked off Johns mask in panic and looked for an exit pronto. What if John had lost the mask and Garf was carrying the spare? As much as I enjoy diving as part of a team, I'm prepared to rely on myself.

Another common misconception I'm afraid. One back up mask per diver is the norm - certainly in cave and on tech courses.

It is hard to explain in words how team diving is not the same as abdicating personal responsibility or self reliance. I need to be strong enough in my skills to be able to help a team member - which is perhaps even more demanding than looking after myself alone. The benefit is that I know they are similarly able to assist me.

[JAG]

Originally Posted by Clare Gledhill

Another common misconception I'm afraid. One back up mask per diver is the norm - certainly in cave and on tech courses.

So, if you listen to GUE divers, don't believe all you hear? I suppose this is where you need to attend the course then, to avoid misinformation.

[Conor]

Originally Posted by Brian of Aquanauts

I'm with Bob on this one, if you are neutral and are not hanging on to your reel/smb you can hold a perfect 6m stop. I know I am not going deeper or shallower as I'm hovering with my computer in front of me on my wrist, and the display is not changing. We did this on the recent tech 2 course, one of the team got seasick during the stop but hey ho, it was quite lumpy and we were moving up and down a bit but didn't change depth/pressure by more than 30cm.

Doh, I guessed at 25cm

I think its a case of viscious agreement, there would be a little movement, but not enough to cause a problem. When holding a reel in swell you can feel it being pulled up and down, as it is anchored to the surface that means the amount of water above you is increasing/decreasing at the same time, and so it the associated pressure. The Diver would move up and down to an extent which would ansorb some of this change, but obviously not by the full amount cos if he did he wouldn't feel the reel moving up and down.

This would mean that a 1m range of movement would cause the reel to move up or down by 50cm, a diver would move up and down my some amount less that that (depending on their depth...the deeper the less movement). So if they moved up and down by 25 cm, a range of 50cm, meaning a pressure change of 0.05 atm... i.e. bugger all really, but enough to make someones ears feel dodgy, the sensitive souls to get sea sick and those with too much air onboard and difficulty holding stops to feel floaty in terms of cns effects etc it would all eaven out over time as the average would remain the same.

Sorry, just friday afternoon academic waffling