What is the size requirement for a "skier-down" flag?

The size requirement for a "skier-down" flag is at least 12 inches square. This specific size ensures that the flag is large enough to be easily seen by other boaters, which is essential for safety when someone is down in the water. The flag serves as a visual signal to alert other vessels that a skier or rider requires immediate assistance. Having a flag of this minimum size helps to maintain visibility and prevent accidents, as it stands out against various backgrounds on the water. Larger flags have their own advantages for visibility, but the regulation stipulates that a flag must be at least 12 inches square to be considered adequate for safety purposes.