27: OTHER RACE COMMITTEE ACTIONS BEFORE THE STARTING SIGNAL

No later than the warning signal, the race committee shall signal or otherwise designate the course to be sailed if the sailing instructions have not stated the course, and it may replace one course signal with another and signal that wearing personal flotation devices is required (display flag Y with one sound).

No later than the preparatory signal, the race committee may move a starting mark.

Before the starting signal, the race committee may for any reason postpone (display flag AP, AP over H, or AP over A, with two sounds) or abandon the race (display flag N, N over H, or N over A, with three sounds).