What is the color of the sidelight on the starboard side of a sailing vessel navigating at night?

• A. Red
• B. Blue
• C. White
• D. Green

Answer: (D)

The sidelight on the starboard side of a sailing vessel is green. This color coding is part of the international system of navigation lights that helps identify the direction in which a boat is facing when viewed at night or in poor visibility conditions.

When sailboats or powerboats are navigating, the green light indicates that the boat is approaching from the starboard side (right side when facing forward). The opposite side, the port side, has a red sidelight. This differentiation allows other vessels to determine the relative position and course of nearby boats, enhancing safety on the water.

For clarity, sidelight colors are standardized internationally, which means that regardless of a vessel's nationality, the green light designates the starboard side. Knowing these colors is crucial for understanding navigation rules and ensuring safe passage during nighttime sailing or in low-light conditions.