A green sidelight means you are looking at a boat's _____________ side.

The green sidelight is specifically positioned on the starboard side of a vessel. In nautical terminology, the starboard side refers to the right side when facing the bow (front) of the boat. According to the International Regulations for Preventing Collisions at Sea (COLREGs), vessels must exhibit specific navigation lights when underway, and the green light serves as a crucial indicator for other boats to determine the orientation and direction of travel of the vessel displaying it. Thus, if you see a green sidelight, you can confidently infer that you are seeing the starboard side of that particular boat. This understanding is vital in navigation and ensuring safe passage in waterways where multiple vessels operate.