All About Aircraft lighting - FlightGear wiki

Lights on a vessel, aircraft or spacecraft offering info on a craft's position, heading, and status Integrated green and red navigation light at the bow of a sailboat A navigation light, also referred to as a running or position light, provides illumination on a vessel, aircraft or spacecraft.

Their placement is mandated by international conventions or civil authorities. Navigation lights are not planned to offer lighting for the craft making the passage, only for other craft to be knowledgeable about it. In 1838 the United States passed an act requiring steamboats running between sunset and daybreak to carry one or more signal lights; colour, exposure and area were not defined.

The admiralty worked out these powers in 1848 and needed steam vessels to show red and green sidelights as well as a white masthead light whilst under method and a single white light when at anchor. In 1849 the U.S. Congress extended the light requirements to cruising vessels. In  Reference  United States convened the very first International Maritime Conference to consider policies for avoiding crashes.

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in 1890 and became efficient globally in 1897. Within these guidelines was the requirement for steamships to bring a 2nd mast head light. The global 1948 Security of Life at Sea Conference recommended a necessary second masthead light solely for power driven vessels over 150 feet in length and a repaired sternlight for almost all vessels.

The International Regulations for Avoiding Crashes at Sea developed in 1972 stipulates the requirements for the navigation lights needed on a vessel. Fundamental lighting [modify] Fundamental lighting configuration. 2=a vessel facing straight towards observer; 4=vessel dealing with far from the observer. To avoid crashes, vessels mount navigation lights that permit other vessels to figure out the type and relative angle of a vessel, and therefore choose if there is a danger of collision.

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