If a vessel displaying a blue flashing light is approaching from astern, what should you do?

When a vessel displaying a blue flashing light is approaching from astern, it indicates that it is an emergency service vessel, which includes police, fire, or coast guard units. In such instances, the rules of navigation dictate that you must give way to emergency service vessels, as they often need to maneuver quickly or respond urgently to their duties.

In this scenario, standing on would not be appropriate because it is not simply an overtaking situation; the nature of the blue light signifies that you need to take action to allow the emergency service vessel to proceed safely and without delay. Providing a clear path ensures that the emergency vessel can carry out its mission effectively.

Maintaining awareness of your surroundings and being prepared to yield is crucial when encountering vessels with special signals like a blue flashing light.