Aid to Navigation: A buoy, beacon, lighthouse, lightship or any other structure or device installed, built or maintained for the purpose of assisting the navigation of vessels.
Alternative Use: The non-navigational use of an authentic lighthouse to preserve and generate support for the historic structure. This can also take place in a lighthouse that is still used for navigational purposes.
Automated: A lighthouse that has been changed to operate
without the aid of a keeper. A keeper may still be retained for maintenance
Chariot: The wheeled carriage at the bottom of a Fresnel lens assembly that allows the lens to rotate around a circular iron track atop the lens pedestal.
Crib: A structure, usually of timbers sunk in water through filling with stone, that served as the foundation for a structure built atop it. (sample image)
Daymark: Unique colour, pattern or architecture of
towers and other markers to help navigators identify their location
during the day. (sample image)
De-staffed: An automated lighthouse without a lightkeeper.
Focal Plane: The height above the water level at which the centre of the light emanates.
Interim Lightkeeper: A lightkeeper who served on a temporary basis, usually between the appointments of full-time lightkeepers.
Lighthouse: Enclosed tower with an enclosed lantern built by a governing authority as an aid to navigation.
Lightstation: Light tower and associated buildings
(dwellings, sheds, boathouses, and fog alarms) and the land they occupy.