Question 30 ONC06 - Master LT 100 GRT

The Correct Answer is C **Why option C ("sailing vessel") is correct:** Illustration D080RR shows a combination of navigation lights: a **red over green** all-round light configuration. According to both the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 25 and the U.S. Inland Rules, a power-driven vessel underway must show sidelights and a sternlight, and if applicable, masthead lights. However, a **sailing vessel** underway may show the standard sidelights and a sternlight (required for vessels over 20 meters, and must be shown if over 7 meters) but *may* also exhibit the optional combination lantern showing **red over green** lights at the top of the mast. This specific vertical configuration (red over green) is designated solely for identifying a sailing vessel underway. **Why the other options are incorrect:** * **A) vessel on pilotage duty:** A vessel engaged in pilotage duty (Rule 29) displays **white over red** all-round lights. * **B) law enforcement vessel:** While law enforcement vessels often use special flashing blue lights (under Inland Rules), the internationally recognized signal lights for common vessel statuses do not use the red over green configuration. A vessel showing its normal navigation lights would use standard power-driven vessel lights. * **D) vessel engaged in fishing:** A vessel engaged in fishing (Rule 26) displays **red over white** all-round lights (with the apex of the cones touching). The green over red configuration is not used for fishing vessels.