• Position finders
  1. Google Maps (includes layers for OpenStreetMap (OSM) and relief maps from maps-for-free.com (MFF)
  2. OpenLayers with Google Maps
  3. OpenLayers with Google, OSM and MFF ("spherical Mercator" with MFF as a TMS)
  4. Spain: OpenLayers with IGN topo maps and PNOA aerial photographs from IDEE (WMS)
  5. GB: I could also set one up for the Ordnance Survey's new OpenSpace API, based on OpenLayers, but Bill Chadwick already has an excellent one at wheresthepath.googlepages.com

Google Maps with overlay of Camino de Santiago in Asturias and Navarra - detailed files provided by regional governments, which may take a while to load: Asturias: Google Earth file, split in two layers for coastal and interior routes; Navarra: ESRI shapefile, converted to Google Earth file