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What does three short blasts signal?

  1. Engine is in reverse

  2. Altering course to Starboard

  3. Danger or confusion

  4. Sailing vessel operating in low visibility

The correct answer is: Engine is in reverse

When three short blasts are sounded, it indicates that the engine of a vessel is in reverse. This signal is used when docking, maneuvering in tight spaces, or when avoiding a collision with another vessel. It's important to note that this signal specifically refers to the engine being in reverse, so options B, C, and D are incorrect because they signal different scenarios. Altering course to Starboard is signaled by a prolonged blast, danger or confusion is signaled by five short blasts, and a sailing vessel operating in low visibility is signaled by one prolonged blast followed by two short blasts. Therefore, only option A accurately reflects the intended meaning of three short blasts.