1. escort lighting: the lighthouse is a tower-shaped luminous beacon built near the key parts of the waterway, which is a fixed beacon. Its basic function is to guide ships to sail or indicate dangerous areas (usually used to mark dangerous coasts, dangerous sandbanks or reefs and navigation channels leading to the estuary).

2. Geographical coordinates: With the rapid development of science and technology and the establishment of integrated navigation system of radar transponder, DGPS system and AIS ship automatic identification system, the navigation function of lighthouse is weakened and its navigation value is reduced, but it has potential historical and cultural value and has become a human geographical coordinate sought after by all countries.

3. Military defense: Lighthouses, known as maritime beacon towers, were also used for military purposes in the past, for coastal defense and prevention of smuggling. Generally, there are fortresses, castles and other defense facilities near lighthouses.

Extended data:

High-pole lighting lighthouse

The poles of high-pole lamps are now poles of high-pole lamps in China, and most of them are made of steel poles. There are three types of steel poles: four-column, three-column and single-column.

Due to the improvement of processing technology, some of them are changed into tapered rods with small upper end, large lower end and variable diameter. According to the different height and modeling requirements, there are dozens of kinds of cone rods, such as flying and hats, but morning glory is the most common one.

Foundation of high-rise lighting lighthouse The foundation of high-rise lighting lighthouse generally adopts reinforced concrete circular plate foundation. In order to resist wind and earthquake, the buried depth of the circular plate foundation is not less than 2.5m