Which light configuration indicates a power-driven vessel at anchor?

The indication of a power-driven vessel at anchor is represented by one white light displayed at the masthead. This configuration aligns with maritime navigation rules, specifically the International Regulations for Preventing Collisions at Sea (COLREGs), which establish the standards for vessel lighting to communicate their status and activity to other vessels.

When a power-driven vessel is anchored, it is required to show one all-round white light visible from all directions. This signal informs other vessels in the vicinity that the power-driven vessel is not underway and is secure at anchor, which is vital for preventing collisions, especially in areas with heavy maritime traffic.

The other combinations of lights represent different navigational statuses or vessel types; for example, two red lights indicate a vessel that is restricted in ability to maneuver, while a combination of green and red lights typically represents a sailing vessel under sail. Thus, understanding the proper configuration for anchoring is crucial for safe navigation and compliance with maritime regulations.