BOTH INTERNATIONAL & INLAND You see a vessel displaying ONLY the lights shown in illustration D045RR below. This vessel could be which of the following?

Correct Answer: Option A — power-driven vessel underway

Illustration D045RR depicts a masthead light and sidelights, the standard configuration for a power-driven vessel underway as defined in Rule 23. A vessel is considered underway when not at anchor, made fast to the shore, or aground, necessitating these specific navigation lights to indicate her status and heading.