Question 30 GLI01 - Master-Unlimited Tonnage

The Correct Answer is C **Explanation for Option C (sailing vessel) being correct:** The illustration D080RR shows a single white light visible at night. This light is positioned high above the deck and is the **sternlight** (also known as the wake light). According to the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 25 (Sailing Vessels Underway and Vessels Under Oars), a sailing vessel underway must show sidelights (red and green) and a sternlight (white). If a sailing vessel is viewed from directly astern, only the white sternlight is visible. Therefore, seeing only a white light positioned high above the deck is characteristic of observing a sailing vessel from astern. **Explanation for why the other options are incorrect:** * **A) vessel on pilotage duty:** A vessel engaged in pilotage duty (Rule 29) displays two vertical lights: an all-round white light over an all-round red light. Seeing only a single white sternlight does not fit this configuration. * **B) law enforcement vessel:** While specific regulations for law enforcement lights vary slightly by jurisdiction, typically they are considered special signals or non-mandatory signals displayed only when necessary (e.g., flashing blue or red lights). When operating normally, they must comply with the standard navigation lights appropriate for their size and power status (e.g., sidelights, masthead light, sternlight). A single white light high above the deck is insufficient to identify a vessel specifically as a law enforcement vessel unless additional, non-standard flashing lights are present, which is not indicated by the sternlight shown. * **D) vessel engaged in fishing:** A vessel engaged in fishing (Rule 26) must display two vertical all-round lights: a green light over a white light (if trawling) or a red light over a white light (if fishing other than trawling). A single white light high above the deck does not match the mandatory lights for fishing vessels.