pilot fish
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DORSETBOY:That's true if the way it's taught is crap, otherwise it's not. Same goes for all courses.
For the nitrox course in particular once you've done the course you should be able to plan your diving to take into account the extra factors that diving on nitrox brings, eg. your O2 exposure after a series of dives. On each dive you should be able to plan the dive taking into account the O2 blend you are using.
My puter will tell me my O2 load. My dive planner on the puter will help too.