What is the visibility angle of a port sidelight?

The visibility angle of a port sidelight is 112.5 degrees. This angle is part of the navigation rules that dictate how and when lights must be displayed on vessels to ensure safety and visibility at sea.

The port sidelight is specifically colored red and serves to indicate the left side of a vessel as seen from the direction the vessel is heading. The reason for the 112.5-degree angle is to ensure that the light is visible from a significant distance, allowing other vessels to determine the position and direction of travel of the ship. This visibility extends from directly ahead of the ship, along the port side and partially towards the rear, contributing to nighttime and low-visibility navigation safety by letting others know of the ship's orientation and preventing potential collisions.

Understanding the significance of the visibility angle is crucial for maintaining maritime navigation rules, which are designed to promote safety for all vessels on the water.