I second the notion of owning a copy of Chapman's. Venturing onto the waterways without a good understanding of the rights of way is irresponsible, inconsiderate, rude and dangerous.
All the rules you really need to know fill less than a page, and yet everytime I go for a sail, there's at least one nitwit who insists on remaining on a collision course with me despite the fact that I have the right of way.
Who can tell whether they don't know or just don't care?
Good for you for seeking this info. Chapman's.