BOTH INTERNATIONAL & INLAND You are under sail with the auxiliary engine running and the propeller engaged on a 15 meter sail vessel. Which statement is TRUE?

Correct Answer: Option D — This condition is indicated by a conical shape, apex downwards.

Rule 25(e) requires a vessel proceeding under sail when also being propelled by machinery to exhibit forward where it can best be seen a conical shape, apex downwards. This visual day shape alerts other vessels that the craft is technically a power-driven vessel, regardless of her sail configuration.