If you see both a red and green sidelight, it means you are looking at the boat ________________________________________.

When you see both a red and green sidelight, it indicates that you are viewing a boat head-on. In maritime navigation, vessels display red and green sidelights to indicate their orientation relative to other vessels. The red sidelight is on the port (left) side of the boat when facing forward, while the green sidelight is on the starboard (right) side. By seeing both lights simultaneously, you can determine that you are approaching the vessel directly from the front, which is critical for correctly understanding how to navigate safely around that boat. This helps in assessing the direction of travel and is vital for avoiding potential collisions.