Question 30 GLI04 - Mate of LT 500-1600 GRT

The Correct Answer is C **Explanation for Option C (sailing vessel) being correct:** The illustration D080RR shows only a single light, which is an **all-around red light**. According to the International Regulations for Preventing Collisions at Sea (COLREGS) and Inland Rules, an all-around red light displayed alone is the required signal for a **sailing vessel** when it is under sail and simultaneously using propelling machinery (i.e., motoring). Rule 25(e) specifies that a vessel proceeding under sail when also being propelled by machinery shall exhibit forward where it can best be seen a conical shape, apex downward. Furthermore, when operating at night under both sail and power, the vessel must exhibit the normal sidelights and sternlight (as required for a power-driven vessel) and, in addition, the **all-around red light**. Since only the all-around red light is visible, it confirms the presence of a vessel operating in this specific condition: a sailing vessel using its engine. **Explanation of why other options are incorrect:** * **A) vessel on pilotage duty:** A vessel engaged in pilotage duty exhibits two all-around lights in a vertical line: the upper light is **white** and the lower light is **red**. Seeing only an all-around red light does not match this signal. * **B) law enforcement vessel:** While law enforcement vessels often use flashing blue lights (especially when pursuing), their standard identification lights at night usually conform to those of a power-driven vessel of their size and function, or sometimes specialized flashing blue lights (Inland/some jurisdictions), but they do not typically display a single all-around red light as their identifying signal. * **D) vessel engaged in fishing:** A vessel engaged in fishing (trawling or otherwise) displays two all-around lights in a vertical line: the upper light is **red** and the lower light is **white**. Seeing only an all-around red light does not match this signal.