Beacon

Any artefact, built or floating, visible or recognisable from a distance, whether by land or sea, that is specifically intended to provide a signal or warning for any purpose not exclusive to navigation.

Navigational aid

Any artefact set up, either in the sea or on land, whether built or floating, with the specific purpose, whether primary or otherwise, of assisting seamen in safe navigation. A navigational aid can be lit or unlit and may or may not have an audible signal. When floating, it is always moored in a fixed position.

Lighthouse

A fully or partially enclosed built structure bearing a light that is used as a navigational aid and that is capable of admitting at least one person who can operate or maintain the light entirely from within.

Lightstructure

A built structure bearing a light that is used as a navigational aid but is not capable of admitting one person to operate or maintain it entirely from within.

Daymark

Any unlit, built navigational aid.

Lightship

A floating lit navigational aid that is of sufficient size for it to accommodate at least one person.

LANBY (Large Automatic Navigational Buoy)

A large floating lit navigational aid that possesses telemetry systems, but is not of sufficient size for it to accommodate a person.

Lightfloat

A floating lit navigational aid that has no telemetry installed and is not of sufficient size for it to accommodate a person.

Lightbuoy

A small floating lit navigational aid.

Buoy

A small floating unlit navigational aid that is typically can or cone shaped

Mark

A small floating unlit navigational aid that is typically a pole with a marker mounted on top in a variety of geometrical shapes