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What does five short blasts signal?

  1. Warning for upcoming blind turn

  2. Altering course to Port

  3. Danger, or do not understand approaching boat's intentions

  4. Power-driven vessel operating in low visibility

The correct answer is: Danger, or do not understand approaching boat's intentions

Five short blasts on a horn or whistle usually signifies danger or a warning of some kind. It does not indicate any specific course alteration or vessel operation. If a vessel is approaching with its intentions unclear, five short blasts may be exchanged to indicate a potential miscommunication or danger.