Lighthouses and beacons

A Lighthouse is a major structure equipped with a light on top, with particular characteristics of the light that vary from lighthouse to lighthouse.
The structure has distinctive color, shape and specified height .
Many lighthouses are equipped with sound signals very useful in restricted visibility.
They are established to assist the navigator and are used for landfalls, coastal passages and key navigational points.
A beacon is usually a pile structure, rigidly attached to the seabed or to the shore, with a light installed.
A beacon has a distinguishing shape and color.
It has a letter or number, and usually a reflective tape around it.
If a beacon is unlighted, it is a day beacon.
A beacon marks navigational hazards, usually in shallow bays, small harbors or inland waterways, and indicates a channel.