What navigation lights must sailboats with engines have?

Sailboats that are equipped with engines must display specific navigation lights to ensure safe visibility on the water, especially at night or in low visibility conditions. The correct answer includes red, green, and white lights, which correspond to the requirements set forth in navigation rules.

The red light indicates the port (left) side of the vessel, while the green light represents the starboard (right) side. These colors help other vessels determine the direction a sailboat is facing and its course. The white light typically signifies the stern (rear) of the boat. By utilizing these lights, other boaters can effectively assess the sailboat's position and direction of travel, which is essential for avoiding collisions.

The other combinations of colors mentioned in the choices do not align with established navigation rules and do not provide the necessary information for safe navigation. Each required light serves a distinct purpose in maritime communication and helps maintain safety on the water.