Hi Old Salty,
The longer you spend around other water users, the easier it is to figure out how to pass safely.
The general rule is this:
* Watch to see where your paths will cross.
1) If you know you'll miss the other guy then change direction slightly to make the gap bigger.
2) If you are heading straight for someone then, and only then, make a large assertive change in direction. This puts you back into situation 1 so you both know what's going on.
3) Kiters will move their kite up or down for other kites, but this doesn't really work with windsurfers.
All this port and starboard stuff, overtaking vessel keeps clear etc is all well and good if you're in a big boat, but with kites and windsurfers most of them don't understand the rules. Follow the rules above and you'll be fine