This is a link to a manual on the website of the Dutch Confraternity of Saint James (NGSJ). It will tell you what free navigations apps you can use on your smartphone, and how to load KML and GPX tracks into it for (nearly) all camino's in Spain and other countries in Western-Europe.
'Het Nederlands Genootschap van Sint Jacob - NGSJ' (The Dutch Confraternity of Saint James) has a new downloadpage with many KML/GPX files. These files can be used in smartphones apps like Maps.me, but also in devices like Garmin.
The URL: https://www.santiago.nl/downloads
All these files go...