Question 10 RVR01 - Master of Unlimited Tonnage

The Correct Answer is A. **Explanation for A (fishing vessel):** The illustration D070RR (which typically depicts the required navigation lights for a vessel engaged in fishing) shows a combination of lights: 1. **Masthead light(s)** (and sidelights/sternlight, which are standard for power-driven vessels). 2. **A vertical line of two lights in the area where they can best be seen:** the upper one is **red**, and the lower one is **white**. This specific vertical arrangement (Red over White, or "fishing at night") is the defining signal required by the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 26 for a vessel **engaged in fishing, other than trawling**. **Why other options are incorrect:** **B) motorboat:** A standard power-driven vessel (motorboat) is required to display a masthead light(s), sidelights, and a sternlight. It does not display the specific vertical combination of red over white lights unless it is also engaged in fishing or some other restricted activity (like towing or restricted in ability to maneuver). **C) sailboat:** A standard sailing vessel is generally required to display only sidelights and a sternlight, or, alternatively, a combination lantern. If it is under 20 meters, it may optionally display a tri-color light at the top of the mast. It does not display the red over white vertical lights unless it is also engaged in fishing. **D) pilot boat:** A pilot boat on duty is required to display a vertical line of two lights: the upper one is **white**, and the lower one is **red** (White over Red, or "pilot ahead"). This is the inverse of the fishing light configuration and serves a different purpose (COLREGs Rule 29).