International Only: What light signal is used to indicate passing intentions?

• A. One flashing white light
• B. All-round white light only
• C. White light forward and stern light
• D. All-round red light

Answer: (B)

The signal being tested is a single all-round white light. In International Regulations, this distinct, unobtrusive light is the visual way for a vessel to indicate to another vessel that it intends to pass. Because it is white and visible in all directions, it’s easy to recognize at night or in poor visibility, helping the other vessel understand that overtaking or passage is planned so both can take appropriate action to avoid a close-quarters situation. The other options don’t convey passing intentions: a flashing white light doesn’t have a standard meaning for this maneuver, the white forward and stern running lights are just the normal underway lights, and an all-round red light signals danger or special statuses rather than passing intent.