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What does the signal of one prolonged blast plus two short blasts every two minutes indicate?

  1. Underway sailing vessel

  2. Power-driven vessel in restricted visibility

  3. Danger or confusion

  4. Sailing vessel operating in low or restricted visibility

The correct answer is: Sailing vessel operating in low or restricted visibility

Passing the signal of one prolonged blast plus two short blasts every two minutes indicates that a sailing vessel is operating in low or restricted visibility. In contrast, choice A is incorrect because underway sailing vessels do not typically use this signal, and choice B is incorrect because it is used for a power-driven vessel in restricted visibility. Choice C is also incorrect because it implies that the signals are meant to create danger or confusion, which is not the case. Ultimately, the specific signal given indicates a situation where a sailing vessel is navigating through low or restricted visibility conditions.