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?

Correct Answer: Option A — NW

If you are heading South and see a vessel's sidelights one point on your port bow, you are observing the vessel's starboard side. For the vessel to be on your port bow while you head South, the vessel must be heading in a Northwesterly direction to be crossing your path.