What type of sound indicates a vessel is in distress?

A distress signal from a vessel is communicated through a specific sound pattern recognized internationally. The correct answer is characterized by five short blasts on the horn. This signal is universally understood to convey that a vessel is in trouble and requires assistance. It serves as an urgent warning to surrounding vessels, indicating an emergency situation.

In maritime practice, it's crucial to recognize this sound as a call for immediate attention from nearby maritime traffic or authorities. This understanding helps ensure swift responses to distress situations at sea, safeguarding life and property.

Other sound patterns serve different purposes. For instance, one prolonged blast can indicate a vessel's presence in restricted visibility, while three short blasts typically represent the intention to reverse. Two short blasts may indicate that a vessel is altering its course to starboard. Each of these signals has a specific function that does not pertain to indicating distress.