What navigation lights must a power-driven vessel under 7 meters display if not in sight of other vessels?

A power-driven vessel under 7 meters in length, when not in sight of other vessels, is required to display one all-round white light. This regulation is designed to ensure that the vessel remains visible to other vessels in conditions where visibility may be limited, such as during nighttime or poor weather conditions. The all-round white light provides a clear indication of the vessel's presence to others, which enhances safety on the water by preventing collisions.

The requirement for only one light, rather than two, simplifies compliance for smaller vessels while still maintaining a standard for visibility. Additionally, the use of an all-round white light prevents confusion about the vessel's orientation or maneuvering intentions, which can be crucial in a navigation situation where other vessels may be nearby, even if not immediately visible.