What does a light signal of three flashes mean?

What does a light signal of three flashes mean?

• A. I am not under command
• B. I am engaged in a towing operation
• C. I am altering to port
• D. I am operating astern propulsion

Answer: (D)

Three short flashes from a vessel’s navigational light are a standard signal meaning the vessel is operating astern propulsion. This communicates that the ship is backing up and may have limited maneuverability, so other vessels should exercise caution and avoid sudden actions that could interfere. The other options refer to different situations or signals that use other light patterns or forms of communication, not three quick flashes.

Three short flashes from a vessel’s navigational light are a standard signal meaning the vessel is operating astern propulsion. This communicates that the ship is backing up and may have limited maneuverability, so other vessels should exercise caution and avoid sudden actions that could interfere. The other options refer to different situations or signals that use other light patterns or forms of communication, not three quick flashes.