What is the color of the side light on a starboard side of a vessel?

Answer: B — Green

The color of the side light on the starboard side of a vessel is green. This is an essential aspect of navigation rules outlined by the COLREGs, which specify the color coding for vessel lights to ensure safe passage and avoid collisions. The green side light indicates the starboard side of the vessel, while the red side light indicates the port side. This color distinction allows other vessels to identify the orientation and course of a ship, especially during nighttime operations or in reduced visibility conditions. The use of standardized colors for navigation lights enhances safety by helping mariners quickly assess the relative position and direction of other vessels. In maritime practice, understanding the significance of these lights is critical for maintaining situational awareness and adherence to the Rules of the Road while underway.