Question 401Navigation General

The correct answer is B) Five short blasts. According to the USCG Navigation Rules, International-Inland, Rule 35(d), when a vessel approaches a drawbridge that is closed, the vessel must sound five short and rapid blasts of the whistle or horn to request the opening of the draw. This signal alerts the bridge operator that a vessel is waiting to pass through the draw. The other options are incorrect because they do not match the regulatory requirement for the proper sound signal to request the opening of a closed drawbridge. Three short blasts (A), one prolonged blast followed by three short blasts (C), and one prolonged blast followed by one short blast (D) are not the appropriate signals specified in the Navigation Rules for this situation.