Lighthouses
Definition of a Lighthouse
A lighthouse is a tower, or substantial building or structure, erected at a designated geographical location to carry a signal light and provides a significant daymark. It provides a long or medium range light for identification by night.
Description of a Lighthouse
It may provide a platform for other AtoN such as DGNSS, racon or AIS as an Aids to Navigation to assist marine navigation. A lighthouse is a structure that may provide a daymark for identification by day. A sector light may also be incorporated into the structure.
Source: IALA