Credits
Footprint’s map, places and road lines come from open data and free services.
OpenStreetMap contributors
The map, the place search (Nominatim) and the road lines come from OpenStreetMap data, available under the Open Database License (ODbL).
GeoNames
Most town and city names and positions come from GeoNames, licensed under Creative Commons Attribution 4.0 (CC BY 4.0).
OpenFreeMap
OpenFreeMap serves the map tiles, built with the OpenMapTiles schema from OpenStreetMap data.
Natural Earth
The country shapes that tint the map come from Natural Earth, which is in the public domain.
OurAirports
Airport codes and positions come from OurAirports, which is in the public domain.
FOSSGIS
FOSSGIS runs the OpenStreetMap road router that draws drives, buses and trains along the roads.