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What does two short blasts signal according to International rule 34(a)?

  1. Altering course to Starboard

  2. Warning for upcoming blind turn

  3. Engine is in reverse

  4. Altering course to Port

The correct answer is: Altering course to Port

According to International rule 34(a), two short blasts signal that a vessel is altering its course to Port. This indicates that the vessel is turning to its left. Option A, altering course to Starboard, is incorrect because Starboard refers to the right side of a vessel. Option B, warning for upcoming blind turn, is incorrect as this is not a recognized signal according to the International rules. Option C, engine is in reverse, is also incorrect as this is indicated by three short blasts, not two. Therefore, option D, altering course to Port, is the correct answer.