Which sound signal indicates doubt that sufficient action is being taken by another vessel to avoid collision?

Which sound signal indicates doubt that sufficient action is being taken by another vessel to avoid collision?

• A. Five short and rapid blasts of the whistle.
• B. One prolonged blast.
• C. One short blast.
• D. Two prolonged blasts.

Answer: (A)

Five short, rapid blasts are the specific warning used to express doubt that the other vessel is taking sufficient action to avoid collision. It serves as a clear prompt that you believe the other vessel needs to change course or speed to prevent a potential accident. The rapid, distinctive pattern makes it unmistakable, signaling urgency and prompting an immediate response. Other signals are used for different communications, such as indicating a turning or slowing action or hailing, but they do not carry the message of doubt about the other vessel’s collision avoidance.

Five short, rapid blasts are the specific warning used to express doubt that the other vessel is taking sufficient action to avoid collision. It serves as a clear prompt that you believe the other vessel needs to change course or speed to prevent a potential accident. The rapid, distinctive pattern makes it unmistakable, signaling urgency and prompting an immediate response.

Other signals are used for different communications, such as indicating a turning or slowing action or hailing, but they do not carry the message of doubt about the other vessel’s collision avoidance.