When is each person on board a boat required to wear an approved life jacket?

Each person on board a boat is required to wear an approved life jacket when the vessel is underway, especially in certain conditions like when operating on open waters or in rough weather. Additionally, children under a specified age, often 12 years old, are generally required to wear life jackets at all times, regardless of the boat's status. Some states and regulations may have specific requirements regarding life jacket use during activities like waterskiing or when the boat is at anchor. Always check local laws for the most accurate requirements.