Quote: (Originally Posted by decoweenie)
As far as the agency is concerned, back to air diluent and air depth limit.
I think the "justifications" for the additional training are (right or wrong is up to your opinion):
- different bail-out procedure for CC Trimix (against OC Trimix)
- multiple bail-out procedures available on CC
- different gas volume computation due to limited number of stages
- buoyancy issues with additional source (i.e. loop volume)
I am sure there are more, but those are the first ones popped in my mind...
Hmmmm, as you say "right or wrong....", I just don't see that much difference. Bale out is baleout after all. And I still breath the same on OC baleout or OC baleout. CCR to SCR baleouts / manual injection is a skill set, but we covered those on Mod 1. As for bouyancy issues, that just comes down to being aware, surely?
Anyway, even assuming that all the above points are relevant, it would appear that there would be a lot of the CCR3 training course that just isn't applicable for a Tmx OC diver going from CCR1 to CCR3. I just seem to remember a lot of wasted time on my Mod3 course, covering OC theory and practice I'd already done. I was just wondering if things had improved.
The nagging think in the back of my mind was once upon a time I thought there was talk of passing OC to CCR as being at the OC level. That is if OC trimix was held, CCR trimix was what you were "allowed" to dive. After all, you can buy the gas, it just comes in smaller tins........ Ho hum.......