BOTH INTERNATIONAL & INLAND You are on a vessel heading due south and see the lights shown in illustration D051RR below one point on the port bow. What direction could this vessel be heading in?

Correct Answer: Option A — NW

Illustration D051RR depicts a vessel showing two masthead lights and sidelights. If you are heading south and see this one point on your port bow, the other vessel is crossing. Given the geometry of the lights, a heading of NW places the vessel in a crossing situation relative to your position.