Question 30

The Correct Answer is C **Why option C ("sailing vessel") is correct:** Illustration D080RR shows a vessel displaying two all-round lights in a vertical line: **Red over Green** (RG). According to the International Regulations for Preventing Collisions at Sea (COLREGs), Annex I to 33 CFR Subchapter C, Rule 25, a sailing vessel, when underway and also under power, may in addition to the lights prescribed for a sailing vessel, exhibit forward where it can best be seen **an all-round light red over an all-round light green** (RG). This combination (Red over Green) specifically identifies a sailing vessel that is operating using both sail and machinery (under power). Since the prompt states you see *only* this light, this unique signal is the definitive indication of a sailing vessel operating under power. **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** (WR), with the white light above the red light. This is different from the Red over Green (RG) shown. * **B) law enforcement vessel:** While law enforcement vessels often use flashing blue lights (when authorized), they do not use the specific Red over Green (RG) all-round lights as their primary identification signal mandated by COLREGs. * **D) vessel engaged in fishing:** A vessel engaged in fishing (not trawling) displays two all-round lights in a vertical line: **Red over White** (RW), with the red light above the white light (indicating "nets in the water"). Trawlers display Green over White (GW). Neither matches the Red over Green (RG) signal.