Generally speaking, when the wind shifts with multiple classes on the same course, it's impractical to effectively use change marks anyway.
First time I have done this RC boat thing but that is what I saw. The PRO's solution kept the first fleet racing (granted that the 17 fleet was small and faster then the next starters the 16's)
So I am a bit confused... Matt seems to say... no changes in the SI's are needed. You think an additional line in the SI's would be needed. What am I missing?
I think everyone agrees that telling the racers about this mark change strategy before hand is a win for everyone.