this is more kiter to kiter related and as already stated, its more about common sense, just because you have priority by the handbook doesn't mean your going to get it that way...
this is basically iko book stuff....
The rider that is leaving the beach has right of way over the rider that is traveling towards the direction of the beach. This is because the rider on the beach is seen more at risk than the inbound rider.
When two kiter's converge the rider who's right hand is forward (starboard) of the direction of travel has right of way over the kiter that who is coming from the other direction (port tack).
When passing each other the kiter upwind must place his kite high and the down wind rider must place his kite low (duh)
The kiter that is riding the wave has right of way over the kiter that is heading out the back. This takes precedence with kiting over starboard and port tack right of way rules.
so in a sw seabreeze in perth at ocean reef if your heading in you have right of way to the person thats heading out unless of course your on the beach about to start, then you have right of way

in a nw direction its the other way around, kiter heading out has right of way (unless other rider is on a wave).
in esperance in a se seabreeze the person heading in has right of way over the person heading out..
but my biggest peeve is riders that tailgate especially in decent sized surf.