What is the signal for power-driven vessels when underway and making way in restricted visibility?

• A. 1 Long Blast every Two Minutes
• B. 1 Prolonged Blast in not more than two-minute intervals
• C. 2 Short Blasts Every Minute
• D. 1 Short Blast Every 15 Seconds

Answer: (A)

In restricted visibility, ships use sound signals to tell others what they’re doing. A power-driven vessel that is underway and making way should sound a single prolonged blast, repeated at intervals not exceeding two minutes. The long blast is easily heard in fog and clearly communicates that you are moving, helping nearby vessels gauge your presence and speed so they can take appropriate action. Other sound patterns indicate different situations—such as a vessel not making way or one restricted in its ability to maneuver—so that specific pattern is reserved for a moving power-driven vessel to avoid confusion.