How do I set up a open water course?

Folks, At the risk of asking a stupid question, how do you measure out and mark an "out and back" or "triangle" open water course? Do I need a GPS? How big a buoy should I get? Any rope in particular? Anchor weights? I'm thinking of just a barebones 1-1.5 mile race in a Lake. I would of course do all of the butt-work including the course set up.
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