PART 3 - CONDUCT OF A RACE
25 NOTICE OF RACE, SAILING INSTRUCTIONS AND SIGNALS
25.1 The notice of race and sailing instructions shall be made available to each boat before a race begins.
25.2 The meanings of the visual and sound signals stated in Race Signals shall not be changed except under rule 86.1(b). The meanings of any other signals that may be used shall be stated in the sailing instructions.
25.3 A race committee may display a visual signal by using either a flag or other object of a similar appearance .