A vessel being propelled both by sail and by engines is a power-driven vessel.

• A. False
• B. True
• C. Not defined
• D. Only when engines are primary

Answer: (B)

Propulsion by machinery defines a power-driven vessel. If a vessel is being propelled by engines, it falls under the power-driven category even when sails are also being used. The sails may contribute, but the machinery propulsion means it must follow the rules that apply to power-driven vessels. A vessel that relies solely on sails would be a sailing vessel, not power-driven.