Question 30 OSV02 - Mate - Offshore Supply Vessels

The Correct Answer is C **Explanation for Option C (sailing vessel) being correct:** The illustration D080RR (which is described as showing *ONLY* the light shown) must represent a situation where the vessel is displaying the required navigational lights for a specific operation. In both International (COLREGS) and Inland Rules, a **sailing vessel** less than 20 meters in length has the option of combining the required sidelights (red on port, green on starboard) and the sternlight (white) into a single lantern carried at or near the top of the mast where it can best be seen (Rule 25(d)). This single combined unit is often referred to as a "tricolor masthead light." Since this light combines the sternlight and the sidelights, and is placed high up, an observer seeing *ONLY* this light (e.g., if the vessel is coming directly towards them or is far away) is viewing a sailing vessel under sail. **Why the other options are incorrect:** * **A) vessel on pilotage duty:** A vessel engaged in pilotage duty displays two all-round lights in a vertical line: white over red (Rule 29). This is different from the single combined light seen in the illustration (sidelights and sternlight). * **B) law enforcement vessel:** While law enforcement vessels often display special flashing blue lights, they must also display the standard running lights (masthead, sidelights, and sternlight) for their length. The combination light shown is specific to small sailing vessels. * **D) vessel engaged in fishing:** A vessel engaged in fishing (other than trawling) displays two all-round lights in a vertical line: red over white (Rule 26(b)). This is different from the single combined light seen in the illustration.