You are correct here Robi. Such things as left to the event organisors to define in the Sailing Instructions. F16 class rules do not rule in any way or form about who must skipper or whether you can switch places during an event or race. Personally, I don't care at all if a crew changes positions on the boat. Afterall, racing is a team effort and it is still the same team and same boat that is raced.

Wouter