BOTH INTERNATIONAL & INLAND A power-driven vessel underway shall keep out of the way of which vessel(s)?

Correct Answer: Option D — All of the above

Rule 18 establishes the hierarchy of vessels. A power-driven vessel underway must keep out of the way of vessels not under command, restricted in their ability to maneuver, and those engaged in fishing. These vessels are less maneuverable and require the power-driven vessel to take early, substantial action.