How can mariners identify a lighthouse from the sea during daylight?

During daylight hours, mariners identify a lighthouse primarily by the distinctive shape of its structure and its specific color scheme, which is designed to make the tower stand out against the prevailing background.12

To ensure visibility, shore-based lighthouses are typically painted white. However, for structures located in the open sea or those set against a light-colored background, lighthouse authorities use conspicuous bands of contrasting colors—most commonly red or black—to improve recognition.2

In addition to these visual characteristics, mariners can consult official Lists of Lights, which are comprehensive catalogs published by maritime nations that detail the location and physical appearance of navigational aids. These publications, along with updated Notices to Mariners, provide the necessary information for navigators to confirm the identity of a structure while at sea.3