CALL UMP 4              

Rule 11, On the Same Tack, Overlapped
Rule 16.1, Changing Course

Question
Before the start Yellow and Blue are sailing parallel courses. Yellow bears away hard, Blue is unable to keep clear. Contact occurs. There is a Y flag. What should the call be?

Answer
Yellow is a right-of-way boat changing course. She did not give Blue room to keep clear and therefore broke rule 16.1. Penalize Yellow.
If Yellow had borne away slightly and immediately made contact with Blue, then Blue was not keeping clear under rule 11. Penalize Blue.