Which pattern indicates danger in maritime communication?

• A. Three short blasts
• B. Five or more short blasts
• C. One prolonged blast
• D. Five or more long blasts

Answer: (B)

In maritime signaling, a rapid sequence of five or more short blasts is the defined danger signal. It’s used to warn other vessels that there is immediate danger and that they must take action to avoid a collision or hazard. This pattern is designed to be distinctive and is taught so that it can be recognized quickly even in windy or noisy conditions. The other patterns are used for different navigational messages—such as maneuvering or indicating engine status—but none communicates danger as clearly and urgently as five or more short blasts.