Question 21

The Correct Answer is B **Explanation for Option B (Correct Answer):** This scenario is governed by the Inland Rules of Navigation, specifically Rule 34(a) (Maneuvering and Warning Signals). The situation describes two power-driven vessels crossing within sight of one another. Vessel A sounds one short blast, which is defined as the signal to indicate: "I intend to leave you on my port side" (i.e., a port-to-port passing intention in a crossing situation, or taking action to cross ahead). When a proposal signal (like the one short blast given by Vessel A) is sounded, the other vessel (Vessel B) must respond immediately. If Vessel B agrees with the proposed maneuver, they must sound the *same* signal in immediate acknowledgment. Therefore, Vessel B sounds **one short blast** to signify agreement. **Explanation for Incorrect Options:** * **A) three short blasts:** This signal indicates that the vessel is operating astern propulsion (reversing). It is not the signal used to acknowledge agreement in a crossing situation. * **C) two short blasts:** This signal indicates the intention: "I intend to leave you on my starboard side" (i.e., a starboard-to-starboard passing). If Vessel A proposed a port-to-port passing (one short blast), Vessel B sounding two short blasts would indicate disagreement and a counter-proposal, not agreement. * **D) two prolonged blasts followed by two short blasts:** This is the required maneuvering signal for a power-driven vessel operating in conditions of reduced visibility (fog) when under way but stopped and making no way. It is completely irrelevant to an agreement signal in a crossing situation in clear visibility.