Question 30

The Correct Answer is C **Explanation for Option C (sailing vessel):** Illustration D080RR depicts a single vertical masthead showing two lights: a red light positioned above a green light. According to both the International Regulations for Preventing Collisions at Sea (COLREGs) and Inland Rules: 1. **Sidelights (Red and Green):** When viewed head-on or nearly head-on, seeing both the red (port) and green (starboard) sidelights indicates the vessel is coming directly towards you. 2. **Masthead Light:** A power-driven vessel usually displays a white masthead light (or lights) above the sidelights. 3. **Sailing Vessels Underway:** A vessel propelled only by sail, when underway, may exhibit, in addition to its mandatory sidelights and stern light, two non-mandatory all-round lights at the top of the mast or near the top of the mast: **a red light vertically above a green light** (Rule 25(b) International & Inland). This combination is often referred to as the "red over green, sailing machine" lights. Since the illustration shows only the red light over the green light (which signifies a sailing vessel utilizing the optional auxiliary lights) and the sidelights (implied by seeing both colors) but no white masthead light (indicating propulsion by engine), the vessel is a **sailing vessel** underway. **Explanation of Incorrect Options:** * **A) vessel on pilotage duty:** A pilot vessel displays **white over red** all-round lights ("white over red, pilot ahead"). * **B) law enforcement vessel:** A law enforcement vessel typically displays a blue flashing light (Inland Rules), or, if displaying special regulatory lights, they would not be red over green. * **D) vessel engaged in fishing:** A vessel engaged in fishing (other than trawling) displays **red over white** all-round lights ("red over white, fishing at night"). A trawler displays green over white.