Marine navigation lights are used on a watercraft to indicate its position and orientation from sunset to sunrise or in low visibility conditions. The design, performance and installation of navigation lights are governed by the standards and recommended practices specified in various navigation rules such as International Regulations for Preventing Collisions at Sea (COLREGS) published by the International Maritime Organization (IMO) and the Inland Navigation Rules from the United States Coast Guard. These rules specifically require that all motorized watercraft must install and display the correct lights for their particular class. A white signal light, commonly referred to as all-round light, is mounted either at the stern of the boat or at another position aft of the bow lights to project an uninterrupted beam of light in all direction at a certain distance and predetermined elevation. A marine navigation lighting system also include red port side bow lights, green starboard side bow lights, anchor/masthead lights, and transom lights. LED navigation lights are a quantum leap forward in terms of optical control, energy efficiency, durability and reliability. They provide highly dependable performance in demanding condition with dramatically improved visibility and accuracy compared to conventional halogen lights.