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docs/source_references.md

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+# Source References
+
+Verified on 2026-06-30. Check terms again before production use.
+
+## Baseline map/routing data
+
+- Komoot support: the Komoot map is based on OpenStreetMap data for map display, route planning, and POIs.  
+  https://support.komoot.com/hc/en-us/articles/10194668255258-Improve-the-komoot-Map
+
+- OpenStreetMap ODbL license information.  
+  https://wiki.openstreetmap.org/wiki/Open_Database_License  
+  https://osmfoundation.org/wiki/Licence/Licence_and_Legal_FAQ
+
+- OSM tile usage policy: OSM data is free; public tile servers are capacity-limited and not for heavy production app traffic.  
+  https://operations.osmfoundation.org/policies/tiles/
+
+- Geofabrik regional OSM extracts.  
+  https://download.geofabrik.de/  
+  https://www.geofabrik.de/data/download.html
+
+- Planet OSM weekly full database dump.  
+  https://planet.openstreetmap.org/  
+  https://wiki.openstreetmap.org/wiki/Planet.osm
+
+- Overpass API.  
+  https://wiki.openstreetmap.org/wiki/Overpass_API
+
+## Routing engines
+
+- openrouteservice API and backend docs.  
+  https://openrouteservice.org/  
+  https://giscience.github.io/openrouteservice/api-reference/endpoints/directions/
+
+- GraphHopper routing engine.  
+  https://github.com/graphhopper/graphhopper
+
+- Valhalla routing engine.  
+  https://github.com/valhalla/valhalla  
+  https://valhalla.github.io/valhalla/api/turn-by-turn/overview/
+
+- BRouter offline bicycle routing.  
+  https://brouter.de/brouter/  
+  https://brouter.de/brouter/offline.html
+
+## Elevation
+
+- Copernicus DEM GLO-30/GLO-90.  
+  https://dataspace.copernicus.eu/explore-data/data-collections/copernicus-contributing-missions/collections-description/COP-DEM
+
+- NASA SRTM.  
+  https://www.earthdata.nasa.gov/data/instruments/srtm
+
+## Map display and offline map options
+
+- MapLibre GL JS.  
+  https://maplibre.org/  
+  https://www.maplibre.org/maplibre-gl-js/docs/
+
+- OpenMapTiles.  
+  https://openmaptiles.org/
+
+- Protomaps / PMTiles.  
+  https://protomaps.com/  
+  https://docs.protomaps.com/guide/getting-started
+
+## POIs, rules, weather, accommodation
+
+- Overture Maps Places.  
+  https://docs.overturemaps.org/guides/places/
+
+- Protected Planet / WDPA/WDPCA.  
+  https://www.protectedplanet.net/en/thematic-areas/wdpa  
+  https://www.protectedplanet.net/en
+
+- Open-Meteo Forecast API.  
+  https://open-meteo.com/en/docs
+
+- Booking.com Demand API.  
+  https://developers.booking.com/demand  
+  https://developers.booking.com/demand/docs/getting-started/overview
+
+## Device integrations
+
+- Garmin Courses API.  
+  https://developer.garmin.com/gc-developer-program/courses-api/
+
+- Garmin Connect course file import.  
+  https://support.garmin.com/en-US/?faq=wKuZXCaZRP4mWPX5aRz5h5
+
+- Wahoo Cloud API.  
+  https://developers.wahooligan.com/cloud