Finally I have come round to organise some of our trails and tours with the help of Wikiloc.
This page is also available in German Entdecken sie die Ribeira sacra
Wikiloc not only allows recording and following real trails, it also has a very good and detailed map of Spain to download.
Google offline maps for Spain is still not available and the only real good alternative I could find are the OSM maps.
Wiciloc apps are downloadable for nearly every device.
Try it and start enjoying the hidden gems of rural galicia and the Ribeira Sacra.