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What does one short blast signal according to International rule 34(a)?

  1. Altering course to Port

  2. Altering course to Starboard

  3. Engine is in reverse

  4. Warning for upcoming blind turn

The correct answer is: Altering course to Starboard

One short blast signal according to International rule 34(a) is a warning signal for altering course to Starboard. This means that if a vessel hears one short blast, they should be alert and on the lookout for other vessels that may be making a turn to Starboard. Option A is incorrect because one short blast is not a signal for altering course to Port. Option C is incorrect because a reverse engine is usually signalled by 3 short blasts. Option D is incorrect because one short blast is not a warning for an upcoming blind turn, but rather a signal for a vessel's own intention to turn to the right.