Amateur radio is entwined with a lot of geospatial data: countries, states, grid squares, positions, parks, and more. In some cases, the map you want to see may already be available. However, in others, the map you are looking for doesn’t exist yet. This session will cover foundational spatial data concepts and how to go about making your own maps, working with open-source geospatial tools such as QGIS and PostGIS.