Offline Map & GPS

OpenStreetMap tiles with device GPS demo. Works when cached via PWA service worker.

Hardware GPS offline tracking

Use cached OSM tiles and navigator.geolocation in low-signal areas (Hallasan, Udo).

Device statusOnline
  1. Call navigator.geolocation.watchPosition()
  2. On network loss, return SW-cached map tiles
  3. Show POIs and tiles from IndexedDB when offline
Leaflet · OpenStreetMapOnline tiles