- "No georeferenced map was found": the PDF doesn't contain location information. Export it again from QGIS or ArcGIS Pro as a geospatial (georeferenced) PDF.
- The map sits in the wrong place: see Fix a map that sits in the wrong place.
- Preparation failed or stopped: open More → Maps library and tap Prepare again on the map's card. Large maps need some free space on the phone.
- A GIS layer is refused: its coordinate system isn't recognised. See Import GIS data.
Still stuck? Contact us and say what you were trying to do.