Question 937 Rules of the Road

The correct answer is A) A vessel aground may sound a whistle signal. This is correct because under both the International and Inland Navigation Rules, a vessel aground is required to sound a whistle signal consisting of three blasts - one prolonged blast followed by two short blasts - to indicate that the vessel is aground and unable to move. This signal is meant to alert other vessels in the area of the vessel's status. The other answer choices are incorrect. B is incorrect because the signal intervals for sailing vessels are not specified in the rules. C is incorrect because a vessel not under command and a vessel being towed have different fog signal requirements. D is incorrect because a pilot vessel underway is required to sound the same fog signals as other vessels, not just the pilot identity signal.