What is a requirement for children under the age of 13 while underway in an open vessel?

Children under the age of 13 are typically required to wear a U.S. Coast Guard-approved personal flotation device (PFD) while underway in an open vessel. This regulation is designed to enhance safety and reduce the risk of drowning. Additionally, the specific requirements may vary by state, so it's important for boaters to check local laws for any additional regulations.