Through the applications of the map server, we have been making available the results of geological works performed on the territory of the Slovak Republic since 2008. The solution of map applications in our organization is based on a combination of licensed, open-source products and components developed by us. On the server side (back-end) it uses PostgreSQL, ArcGIEnterprise and PHP. Client-side (front-end) ArcGIS API for JavaScript. This solution offers flexible options for displaying various map materials, which are thematically classified into the following groups.