Question 30 MODU01 - Offshore Installation Manager

The Correct Answer is C ### Why Option C ("sailing vessel") is Correct The light configuration described by standard navigation rules (Rule 25) for a vessel that is operating under sail—displaying only the standard **Red sidelight** (port), **Green sidelight** (starboard), and a **White sternlight**—is definitive proof that the vessel is a **sailing vessel**. Crucially, a sailing vessel does *not* display the white masthead (steaming) light required for a power-driven vessel. If the illustration shows only these three basic navigational lights (or a single combined lantern displaying them), the vessel is operating under sail. ### Why Other Options Are Incorrect **A) vessel on pilotage duty:** A vessel engaged in pilotage duty must display the mandatory identification lights of a **white light over a red light (W/R)** at the masthead, in addition to its standard navigation lights (sidelights and sternlight). The vessel in the illustration is missing the specific W/R identification lights. **B) law enforcement vessel:** Law enforcement vessels typically use standard navigation lights, or may employ specialized warning lights (such as blue flashing lights in Inland waters) when engaged in official duties. Their standard display does not uniquely consist only of sidelights and a sternlight. **D) vessel engaged in fishing:** A vessel engaged in fishing (other than trawling) must display the mandatory all-around identification lights of a **green light over a white light (G/W)**, in addition to its standard navigation lights when making way. The configuration for a sailing vessel is missing the essential G/W fishing lights.