Which of the following is not a safety requirement for vessels?

Operating without passengers is not a safety requirement for vessels. In fact, vessels are often designed to carry passengers safely, and their operation is typically intended for this purpose. Safety regulations focus heavily on ensuring that vessels are equipped to handle passengers safely, which includes having essential safety equipment like personal flotation devices (PFDs) and fire extinguishers onboard.

Ensuring operator knowledge of safety practices is also a critical requirement, as a knowledgeable operator can better respond to emergencies and maintain safety protocols while on the water. Thus, whether a vessel is operated with passengers or not does not inherently breach safety regulations; rather, it is essential to follow other safety requirements regardless of passenger presence.