Which side of the bow of a motorized boat must display a green light?

In the context of navigation lights on a motorized boat, the green light is specifically designated to be displayed on the starboard side. This convention is part of the international rules for preventing collisions at sea, ensuring that boats can determine the orientation of other vessels at night or in low visibility conditions.

The starboard light is green, while the port side is indicated by a red light. When approaching another vessel, seeing a green light means that the vessel is facing you from its starboard side, typically suggesting that you are on a path to pass safely to the port side (left side) of that vessel. This system helps maintain a clear understanding among boaters regarding their relative positions and movements, which is crucial for safe navigation.

Other choices such as the port side, stern, and center do not align with the established maritime lighting conventions and would lead to confusion or potential danger if used incorrectly.