BOTH INTERNATIONAL & INLAND A sailing vessel shall keep out of the way of all of the following with the exception of which vessel?

Correct Answer: Option D — engaged on pilotage duty

Rule 18(d) mandates that a sailing vessel must keep out of the way of vessels restricted in their ability to maneuver, engaged in fishing, or not under command. A vessel engaged on pilotage duty is not granted this specific priority over a sailing vessel under the Rules.