Download maps (.map files) and themes (ZIP) anywhere on your phone and select them in a:Drake in Settings → Maps → Edit map configuration (source MapsForge Vector maps: Map file, Map theme file, Selected Theme Name). Themes are read directly from the ZIP archive, no unpacking needed.
The whole world, contour lines, hiking and cycling routes. The recommended Elevate theme (ZIP) is available on the same site.
Czechia, Slovakia, Poland, Saxony, Bavaria, Austria, Croatia
Official Mapsforge maps (OSM-like look, the built-in theme is sufficient).