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This is actually something so fundamental you really need to ask your instructor if you didn't "get it" yet. The internet is great for certain things, but actual scuba lessons covering the same stuff everyone learns for OW isn't one of them. Really, people aren't being unhelpful, you just really need to get this stuff one on one from a qualified instructor.gotcrypt:i was hoping somebody might walk me thru it i am taking naui any furthe help would be nice i am having trouble with some of the tables