How far back can sidelights be seen from a vessel?

Sidelights are important navigational lights used on vessels at night or during periods of reduced visibility. These lights indicate the port (red) and starboard (green) sides of a vessel to other vessels, allowing for safe navigation and avoidance of collisions. The appropriate visibility range for sidelights is crucial for ensuring that other vessels can detect the presence and direction of your vessel from a safe distance.

The standard visibility range for sidelights as per the regulations is typically 22.5 degrees from the bow of the vessel and can be seen from a distance of about 22.5 meters. This visibility ensures that other vessels can identify your vessel's heading, which is essential for safe maritime navigation. Thus, the correct answer indicates that sidelights can be seen from this specified distance, which aligns with the established maritime rules.

Understanding this information is fundamental for safe sailing practices, as recognizing and being recognized by other vessels is critical in preventing accidents at sea.