Which vessel types are indicated by the signal 1 prolonged followed by two short blasts in restricted visibility?

• 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)

The pattern of one prolonged blast followed by two short blasts is the standard sound signal for a sailing vessel under way and making way. In restricted visibility, this pattern tells other vessels that the vessel is primarily propelled by its sails (not just by engine power) and is moving through the water. The option that includes a sailing vessel under way making way aligns with this recognized signal. Other choices point to different signals used for other vessel types (for example, vessels not under command or fishing vessels) and do not match the one-long-two-short pattern.