Describe the correct light display for a vessel less than 12 meters in length.

A vessel less than 12 meters in length is required to exhibit an all-round white light that is visible from all directions when underway. This light serves as a simple yet effective means for other vessels to identify the smaller boat's presence at night or in low visibility conditions. The all-round white light helps to indicate the vessel's orientation and aids in collision avoidance by allowing other boat operators to see the vessel’s position and movement direction.

Larger vessels, or those operating in specific scenarios, may utilize different lighting configurations, such as sidelights, but the requirement for vessels under 12 meters focuses on the visibility of the all-round white light alone, as specified in the navigation rules. This requirement emphasizes the importance of recognizing and understanding the light signals to ensure safe navigation on the water.