When a sailboat's engine is turned on, it is classified as what type of vessel?

When a sailboat's engine is turned on, it is classified as a power-driven vessel because the use of the engine alters the propulsion method of the boat. Although the sailboat may still have sails, activating the engine allows it to be powered by mechanical means rather than solely by wind.

This classification is important for navigation rules and regulations, as power-driven vessels have specific requirements and responsibilities, particularly in terms of right-of-way situations during encounters with other vessels. This distinction helps to ensure safe navigation and adherence to maritime laws.

In comparison, the designation of a sailing vessel applies only when the boat is under sail without the use of its engine. A small vessel refers to size rather than propulsion type. Fishing vessel is specific to boats engaged in fishing activities, which can include both sailboats and power-driven vessels. Thus, the primary characteristic that determines the classification as a power-driven vessel is the active use of its engine.