You absolutely need to be very proficient with a reel for C2 so if all your post class dives have managed to avoid copious reel practice you'll need to find some reel time somewhere
I would say that I did around five dives with a reel, including the dives of the tech1 course. I never found it difficult, but the practice was not enough.
Finding a place to practice is not an issue: I can do it even in open water, possibly very shallow, to make the exercise more difficult, increase bottom time, and add other drills. I can dedicate some dives to training, so if I stay shallow I can collect a lot of hours of practice. However, what does "proficient" mean? That's the tricky part for me
There are a few threads on the issue of Mexico vs. Florida for training.
I have just read this one, a good thread; thanks for the suggestion
Mexico vs Florida (better training caves)
Which of the two make for a better training environment? Mexico with its shallow depths allowing more bottom time per dive or Florida with high flows?
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