![]() ![]() in 1890 and became effective internationally in 1897. The resulting Washington Conference Rules were adopted by the U.S. In 1889 the United States convened the first International Maritime Conference to consider regulations for preventing collisions. Congress extended the light requirements to sailing vessels. The admiralty exercised these powers in 1848 and required steam vessels to display red and green sidelights as well as a white masthead light whilst under way and a single white light when at anchor. In 1846 the United Kingdom passed legislation enabling the Lord High Admiral to publish regulations requiring all sea-going steam vessels to carry lights. In 1838 the United States passed an act requiring steamboats running between sunset and sunrise to carry one or more signal lights colour, visibility and location were not specified. In case of two power-driven vessels approaching head-on, both are required to give way. Therefore a red light is used on the ( left (port)) side to indicate "you must give way" and a green light on the right (starboard) side indicates "I will give way you must stand on". ![]() Consistent with the ground traffic convention, the rightmost of the two vehicles is usually given stand-on status and the leftmost must give way. However, the red and green colours are chosen to indicate which vessel has the duty to "give way" or "stand on" (obligation to hold course and speed). Their placement is mandated by international conventions or civil authorities such as the International Maritime Organization (IMO).Ī common misconception is that marine or aircraft navigation lights indicate which of two approaching vessels has the "right of way" as in ground traffic this is never true. Some navigation lights are colour-coded red and green to aid traffic control by identifying the craft's orientation. ![]() Red and green bottom navigation lights on SpaceX DragonĪ navigation light, also known as a running or position light, is a source of illumination on a watercraft, aircraft or spacecraft, meant to give information on the craft's position, heading, or status. ![]()
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