PART 4 - OTHER REQUIREMENTS WHEN RACING
Part 4 rules apply only to boats racing. However, rule 55 applies at all times when boats are on the water .
40 PERSONAL FLOTATION DEVICES
When flag Y is displayed with one sound before or with the
warning signal, competitors shall wear personal flotation devices, except briefly
while changing or adjusting clothing or personal equipment. Wet suits and dry
suits are not personal flotation devices.