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 notice of race or sailing instructions.
25.3 When the race committee is required to display a flag as a visual signal, it may use a flag or other object of a similar appearance.