Which of the following is the correct phrase for 'one and two short blasts' signals used when two power-driven vessels are in sight of one another and meeting at a distance of one half mile?

• A. One short blast
• B. Two short blasts
• C. One and two short blasts
• D. Three short blasts

Answer: (C)

When two power-driven vessels are in sight of each other and meeting at about half a mile, they use a specific whistle signal to tell the other vessel how they intend to pass. The established phrase for conveying that passing arrangement is “one and two short blasts.” This combination is codified to indicate your intended maneuver in a close-quarters meeting, helping the other vessel understand how you plan to pass and to coordinate course changes safely.

The other options don’t communicate the required passing intention in this scenario. A single short blast, or two short blasts by itself, would not convey the agreed passing action, and three short blasts are used for other maneuvers or signals (such as backing or danger) rather than the specific head-on meeting passing instruction.