Operators of Uninspected Passenger Vessels are required to keep their Coast Guard License aboard __________.

Operators of Uninspected Passenger Vessels are required to keep their Coast Guard License aboard specifically when they are carrying passengers for hire. This requirement ensures that operators can demonstrate their credentials and capability to safely operate the vessel in a commercial setting. The oversight is crucial given the additional responsibilities and safety considerations involved when transporting passengers, as it helps to maintain safety standards and regulatory compliance within the marine industry. Keeping the license on board at all times when passengers are onboard allows for quick verification by authorities if needed.

The other scenarios mentioned do not necessitate the on-board availability of the license. For example, operating more than one mile from shore or at night relates to other safety regulations but does not directly trigger the requirement to have the license present. Therefore, the focus is on the commercial aspect of carrying passengers for hire, which invokes the need for proper licensing documentation at all times.