You are steaming along the coast of Ireland in the Irish Sea. You sight a lighted buoy with a white flashing light showing a group of two flashes. The buoy indicates you __________.

Correct Answer: Option C — should pass well clear on either side of the buoy

A white flashing light showing a group of two flashes indicates an Isolated Danger Mark. These marks are placed directly over a hazard of limited extent and have navigable water all around them. Mariners should pass well clear on any side, as the buoy marks the specific location of the danger.