What defines a vessel as "powered" under navigation rules?

A vessel is defined as "powered" under navigation rules when it is propelled by machinery. This classification includes all types of mechanical propulsion systems, such as engines or motors, that generate the force necessary to move the vessel through the water. This definition is crucial for understanding navigation rules, particularly in determining right-of-way situations, signaling requirements, and operational regulations that apply to powered vessels.

Other options do not meet the definition of a powered vessel. Vessels using manual paddles rely solely on human effort for propulsion and are not considered powered. The length of a vessel does not define its powered status, as even smaller vessels can be equipped with engines. Similarly, vessels sailing without assistance would be classified as sailing vessels, not powered, because they depend on wind rather than mechanical means for propulsion. Therefore, the clear distinction of powered vessels arises from their mechanical propulsion capabilities.