F-LAN is a geospatial data set that documents hundreds of coastal lights that guided ships around France from medieval times to 1929. F-LAN provides visibility range for individual lights. The authors collected all data from scholarly literature and historical coastal navigational charts and official lighthouse surveys. F-LAN allows users to track the provision of coastal lighting over time. It complements the existing LAN dataset for England and Wales.

The data was inputted, and all lights were georeferenced manually. Individual lighthouse locations were copied from official publication lists from 1863, 1872 and 1929. All lights were georeferenced manually and matched against existing coordinates.