BOTH INTERNATIONAL & INLAND Underway at night you see the red sidelight of a vessel well off your port bow. Which statement is TRUE?

Correct Answer: Option C — You may maintain course and speed.

A red sidelight visible on your port bow indicates a vessel crossing from your port to your starboard. Under Rule 15, you are the stand-on vessel. Rule 17(a)(i) requires you to maintain course and speed, provided the other vessel is taking appropriate action to keep clear of you.