Which of the following must follow Navigation Rules for a powerboat?

Powerboats must adhere to Navigation Rules as they are designed for power and maneuverability, which places specific responsibilities on their operators. A sailboat with its engine engaged is treated similarly to a powerboat when it comes to navigation. When the engine is on, the sailboat has the capability of keeping up with other powered vessels and must follow the same navigational protocols to ensure safety on the water.

In contrast, a paddleboard does not have a motor and is considered a non-powered vessel, so it has different rules it must follow. A motorboat traveling in the opposite direction is also a powerboat but doesn't fall under the specific category of vessels needing to be compliant in the same conditions. A fishing boat without its engine on may not be considered a powerboat unless the engine is actively engaged, and thus it may not have the same navigational requirements at that moment.

This distinction emphasizes the importance of understanding how different vessels are categorized under Navigation Rules based on their operation and capabilities.