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What does one prolonged blast (4-6 seconds) signal?

  1. Engine is in reverse

  2. Warning (entering or exiting a blind turn)

  3. Altering course to Starboard

  4. Power-driven vessel operating in low visibility

The correct answer is: Warning (entering or exiting a blind turn)

One prolonged blast (4-6 seconds) signals a warning for entering or exiting a blind turn. Option A (Engine is in reverse) is incorrect because one prolonged blast is not used to indicate reverse. Option C (Altering course to Starboard) is incorrect because altering course to Starboard is signaled by two short blasts followed by one prolonged blast. Option D (Power-driven vessel operating in low visibility) is incorrect because a power-driven vessel operating in low visibility is indicated by three short blasts.