Earth Data Namibia (EDN) is the Geological Survey of Namibia's (GSN) multi-disciplinary geoscience data base, incorporating data from mineral and water exploration, geoscientific research and mapping. Since its launch in 2003 it has evolved from a relatively simple mineral exploration data base, designed to store and make freely accessible tens of thousands exploration reports and maps accumulated since the 1950s - thus preserving irreplaceable information - to a complex system with a variety of modules accommodating most of the data held by the Geological Survey. After 20 years of operation and various upgrades, EDN is a powerful software tool, for both GSN staff and the public, who can search its content on site at terminals in the National Earth Science and Energy Information Centre of the Ministry of Mines and Energy or access it online via the Ministry's website. Keywords: Data management.