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History: In 1838 the United States passed an act requiring steamboats under way between sunset and sunrise to carry one or more signal lights; color, visibility and location were not specified.
In 1848 the United Kingdom passed regulations that required steam vessels to display red and green sidelights [red- showing to the left/port side of vessel & green showing to the right/starboard side of the vessel] as well as a single white masthead light.
In 1849 the U.S. Congress extended the light requirements to include sailing vessels.
In 1889 the United States convened the first International Maritime Conference to consider regulations for preventing collisions. The resulting Washington Conference Rules were adopted by the U.S in 1890 and became effective internationally in 1897. Within these rules was the requirement for steamships, in addition to the red and green sidelights, to carry an additional (i.e.: second) white mast head light located vertically below the first one.
The 1948 international 'Safety of Life at Sea Conference' recommended the adfdition of a mandatory second masthead light - only for power driven vessels over 150 feet in length - and a fixed sternlight for all vessels. The regulations have changed little since then.
To sum up: The navigational lights required to be displayed by a powered ship while it is under way are: Red light to port/left - green light to starboard/right - two vertically mounted white lights on the forward mast and a single white light on the stern.
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