Rhode Island Boater Practice Test

When boating at night, what does a single white light on a vessel indicate?

1. A sailing vessel is approaching you on your starboard side

2. A sailing vessel is approaching you on your port side

3. A power-driven vessel is approaching head-on

4. You are overtaking another vessel or it is anchored

The correct answer is: You are overtaking another vessel or it is anchored

A single white light on a vessel indicates that you are either overtaking another vessel or that the vessel is anchored. In maritime navigation, lighting serves as a crucial means of communication between vessels at night or in reduced visibility. When a vessel shows a single white light at its highest point, it serves as a signal to other boaters that the vessel is either stationary (anchored) or is being overtaken. In the case of anchored vessels, the white light helps to alert approaching boats to their presence, ensuring safety and preventing collisions. When overtaking another vessel, the white light signifies that the overtaken vessel is not displaying any navigation lights that would indicate it is under way or maneuvering, thus making it safe to proceed. Understanding these light signals is essential for safe nighttime navigation, allowing boaters to recognize and interpret the actions of nearby vessels accurately. This knowledge not only enhances safety but also contributes to smoother interactions on the water.