With regards to ITCZ's questions (another question, how do you define the ITCZ? heh), most of the answers can be found in the AIPs. A bit lazy to get off my bum to find them, but they're there. Except for a few that I am unsure of, for example...
What does a gradient in brackets on a SID chart indicate?
So far, I have only seen 'GRAD 3.3%' on the SID chart that I use. Haven't really seen any in brackets.
And the question regarding MDA and OCA... that's a good one. A colleague of mine said that they are basically the same thing. Somebody please dispute him! That would make my day!