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Lights on a vessel, airplane or spacecraft providing information on a craft's position, heading, and status Combined green and red navigation light at the bow of a sailboat A navigation light, also known as a running or position light, provides illumination on a vessel, aircraft or spacecraft.

Their positioning is mandated by worldwide conventions or civil authorities. Navigation lights are not planned to supply lighting for the craft making the passage, just for other craft to be knowledgeable about it. In 1838 the United States passed an act needing steamboats running between sunset and daybreak to carry one or more signal lights; colour, presence and place were not specified.

The admiralty exercised these powers in 1848 and required steam vessels to display red and green sidelights along with a white masthead light whilst under way and a single white light when at anchor. In  This Piece Covers It Well . Congress extended the light requirements to cruising vessels. In 1889 the United States assembled the very first International Maritime Conference to consider regulations for avoiding collisions.

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in 1890 and ended up being effective worldwide in 1897. Within these guidelines was the requirement for steamships to bring a 2nd mast head light. The global 1948 Safety of Life at Sea Conference suggested a necessary second masthead light solely for power driven vessels over 150 feet in length and a repaired sternlight for practically all vessels.

The International Regulations for Preventing Collisions at Sea established in 1972 specifies the requirements for the navigation lights needed on a vessel. Standard lighting [modify] Fundamental lighting configuration. 2=a vessel dealing with directly towards observer; 4=vessel dealing with away from the observer. To avoid crashes, vessels install navigation lights that permit other vessels to identify the type and relative angle of a vessel, and thus decide if there is a risk of accident.

Power driven vessels in addition to these lights, should bring either one or 2 (depending upon length) white masthead lights that shine from ahead to 2 points abaft the beam on both sides. If two masthead lights are brought then the aft one needs to be greater than the forward one.