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What does one prolonged blast every two minutes signal?

  1. Sailing vessel operating in low visibility

  2. Power-driven vessel operating in low or restricted visibility

  3. Warning for upcoming blind turn

  4. Altering course to Port

The correct answer is: Power-driven vessel operating in low or restricted visibility

This answer refers to Rule 35 of the International Regulations for Preventing Collisions at Sea, which states that one prolonged blast every two minutes indicates a power-driven vessel operating in low or restricted visibility. A prolonged blast is generally defined as a sound lasting more than four seconds. Choices A and C are incorrect because they refer to a different type of signal, and choice D is incorrect because it mentions a specific direction rather than the general signal provided in the question. Additionally, choice A is specifically for sailing vessels, while choice B refers to any power-driven vessel.