What color light is allowed for an all-around light in international waters?

The all-around light used in international waters must be white. This requirement is established by the International Regulations for Preventing Collisions at Sea (COLREGs), which outline the rules for navigation to promote safety at sea. A white all-around light can be seen from all directions and is essential for indicating the presence of a vessel at anchor or underway, signaling to other mariners the vessel's position and type.

In nautical navigation, different colors of lights are designated for specific purposes. For example, red and green lights are used for sidelights, while white lights serve as masthead lights. The use of a white all-around light is vital for ensuring visibility and safety, particularly in dark or reduced visibility conditions. Thus, the choice of a white light for the all-around position aligns with these regulations, ensuring that vessels can communicate their status effectively on the water.