I know that Mark Chase always moans about this ! The theory book was/is the same for oc or ccr .Mark said he was totally p***ed off that he had to pay money to basically do the course again (from oc to ccr).Can you not talk to your instructor from oc trimix or does he not teach ccr ? Otherwise talk to matt robinson ,
M R DIVING Midlands Rebreather Diving on here as desperation99
I know he teachs trimix ccr & have heard a lot of good recomendations for him
good luck
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Colin
I trust my rebreather completely ,
I just don't trust the user
onwards & downwards