BOTH INTERNATIONAL & INLAND A sailing vessel displaying the day-shape shown in illustration D035RR is indicating that she is which of the following?

Correct Answer: Option A — being propelled by power as well as sail

COLREGS 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 with the apex pointing downward, serving as a mandatory navigational day-shape warning.