| The PADI stuff is crap. Go for something like Bob Cole's Deco Matrix or read Nigels' stuff if you can make your way through it.
The DM exams must have changes since my day if this sort of thing is in them. I remember inflating some balloons at various depths and trying to explain what use a snorkel is when diving. Piss easy stuff and designed for your burger eating yank.....
Chris |