What is the minimum lighting requirement at night for a power-driven vessel under 7 meters in length, with a speed not exceeding 7 knots?

A power-driven vessel under 7 meters in length and capable of speeds not exceeding 7 knots is subject to specific lighting requirements as outlined in the International Regulations for Preventing Collisions at Sea (COLREGs). According to these regulations, the minimum requirement for such vessels operating at night is to display one all-round white light.

This all-round white light serves to indicate the visibility of the vessel to other mariners, allowing them to assess its presence and direction. The design of the light means it can be seen from all angles, which is crucial for navigation safety.

The other options listed do not meet the requirements for this category of vessel. For example, two all-round white lights would be excessive for a vessel of this size and speed, while a white masthead light or sidelights would not suffice as they do not fulfill the minimum requirements set forth for small vessels operating under the specified conditions.