When radio communications are unavailable, which method conveys status and danger visually?

• A. Audible horn signals only
• B. Internal radio messages
• C. Signal flags
• D. GPS coordinates only

Answer: (C)

When radio communications are down, you need a method that people can see without relying on electronic systems. Signal flags provide exactly that kind of visual, standardized messaging. Using a flag hoist, you can convey your vessel’s status, danger, or need for assistance through internationally recognized flag meanings. This allows nearby ships and shore stations to interpret your message at a glance, even in poor radio conditions and regardless of weather or power supply. Audible horn signals depend on sound to travel and can be muted by wind, distance, or background noise; internal radio messages won’t reach anyone if the radio isn’t functioning; GPS coordinates tell you where you are but don’t communicate your immediate danger or need for help. Signal flags thus offer a reliable visual link for status and danger when radios aren’t available.