Question 21 RVR01 - Master of Unlimited Tonnage

The Correct Answer is B **Explanation for Option B (Correct Answer):** This scenario is governed by the **Inland Rules of Navigation**. The illustration depicts two power-driven vessels crossing, meaning there is a risk of collision. Vessel "A" sounds one short blast. Under Rule 34(a) (Maneuvering and Warning Signals) of the Inland Rules, a power-driven vessel intending to pass another vessel or alter its course must indicate that intention by appropriate whistle signals. One short blast signifies, "I intend to leave you on my port side," or, in a crossing situation where the vessel is the privileged (stand-on) vessel, "I intend to maintain course and speed and will cross ahead of you." Since Vessel "A" has proposed a maneuver (even if it's simply maintaining course and crossing ahead), Vessel "B" must reply immediately. If Vessel "B" is in agreement with Vessel "A's" proposed maneuver and finds it safe to execute, Vessel "B" must sound the *same* signal: **one short blast**. This exchange confirms the agreed-upon maneuver. **Why the Other Options are Incorrect:** * **A) three short blasts:** Three short blasts signifies "I am operating astern propulsion (reversing)." This is not the appropriate signal for agreeing to a crossing maneuver proposed by another vessel. * **C) two short blasts:** Two short blasts signifies "I intend to leave you on my starboard side." If Vessel "A" sounded one blast (port-to-port passing intention or crossing ahead), Vessel "B" sounding two blasts would signify disagreement and propose a different maneuver (a starboard-to-starboard crossing or passing), not agreement. * **D) two prolonged blasts followed by two short blasts:** This signal is the mandatory general "towing signal" for a vessel restricted in its ability to maneuver by the nature of its towing operation. It is not the proper signal for agreeing to a maneuver in a standard crossing situation.