The places and institution locations listed in the register are usually linked to a URI of the free geographic database <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.geonames.org"><hi rendition="#i">GeoNames</hi></ref> provided. This allows the locations to be identified across projects, which greatly simplifies subsequent use of the data. The GeoNames URI is also used to obtain the geographic coordinates, on the basis of which a corresponding map can be displayed with the location and institution entries using the free map service <ref xmlns="http://www.tei-c.org/ns/1.0" target="https://www.openstreetmap.org/">OpenStreetMap</ref>. This is especially helpful for smaller locations of Alexander von Humboldt's various travels.