I was excited when I learned about a way to create custom georeferenced map PDFs (say, based on an official, but not georeferenced, national park map document).

I was excited when I learned about a way to create custom georeferenced map PDFs (say, based on an official, but not georeferenced, national park map document). It used qgis, plus one or two other open source tools. It seemed straightforward, if a bit tedious. But I was never able to get the resulting files to work properly on my Android device. The instructions said to use an app called avenza maps, which would understand the georeference data, and show your maps, other maps, plus routes and tracks, all on one display. It just didn't work consistently for me, sadly. From what I understood, qgis was doing its job properly. It was a neat tool. I guess the whole stack for this use case was just too fragile.