Personal Flotation Devices
40.1: Basic Rule
40.2: When Rule 40.1 Applies
Rule 40.1 applies if (a) flag Y was displayed afloat with one sound before or with the warning signal, while racing in that race; (b) flag Y was displayed ashore with one sound, at all times while afloat that day; or (c) a rule in the class rules, notice of race or sailing instructions states that it applies.