Question 36 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is A. **Explanation for Option A (Correct):** Option A, **one short blast**, is the correct signal for a vessel being overtaken in a narrow channel (under Inland Rules) to indicate agreement for the overtaking vessel to pass on the starboard side. * **Inland Rule 34(c)(ii):** When a vessel being overtaken agrees to a passing on its starboard side (meaning the overtaking vessel passes to the right of the vessel being overtaken), the agreement signal is one short blast. This confirms to the overtaking vessel that the maneuver is safe and permitted. **Explanation for Incorrect Options:** * **B) one prolonged, one short, one prolonged, and one short blast in that order:** This signal is used under the International Regulations (COLREGs), not Inland Rules, to indicate doubt or a failure to understand the intentions or actions of an approaching vessel (Rule 34(d)). It is not the signal for agreement to be overtaken. * **C) two prolonged blasts:** This is not a standard whistle signal under either Inland or International Rules for agreeing to or initiating an overtaking maneuver. Prolonged blasts are generally used for warning signals, maneuvering in sight of one another when leaving a dock, or restricted visibility signals. * **D) two prolonged followed by two short blasts:** This sequence is the danger or disagreement signal under Inland Rules (Rule 34(c)). If the overtaken vessel believed it was unsafe for the other vessel to pass, or disagreed with the proposed maneuver, this would be the signal given, not the signal for agreement.