In Restricted Visibility, which signal is described as 1 prolonged followed by two short blasts?

• A. Sailing vessel under way making way, Vessel Not Under Command, Fishing, Towing or pushing another Vessel
• B. Power driven vessels underway and making way
• C. Vessel Not Under Command Only
• D. Fishing Vessels Operating Alone

Answer: (A)

In restricted visibility, vessels rely on specific whistle signals to communicate their status and actions when visibility is poor. A signal consisting of one prolonged blast followed by two short blasts is a standard pattern used to indicate certain types of vessels and their maneuvering status.

This pattern corresponds to vessels described as sailing vessel under way making way, vessels not under command, fishing vessels, and vessels towing or pushing another vessel. Hearing that sequence tells other nearby vessels that the signaling vessel may have limited ability to maneuver or is in a situation requiring extra caution (like towing or fishing), so others should take appropriate action to avoid a collision.

The other options correspond to different sound-signals for different situations or vessel types, so they don’t match the pattern described.