Question 40 Rules of the Road

The correct answer is D) two short blasts. According to the Inland Navigation Rules, a power-driven vessel overtaking another in a narrow channel and wishing to pass on the other vessel's port side should sound two short blasts on the whistle. This signal indicates the overtaking vessel's intention to pass on the port side of the other vessel. The other answer choices are incorrect because they do not match the specific whistle signal required for this scenario. One short blast (A) is used for different situations, and the two-blast sequences in B and C are not the appropriate signals for passing on the port side in a narrow channel.