I have OsmAnd ( https://github.com/osmandapp/OsmAnd ) on my phone, download the basemaps, download my (small) country data (both sourced from open street maps), and with an app + ~1GB of data, I get the maps and full navigation within my country, POIs, etc., and can add other countries when needed.
Is there something similar for a PC? I can download data from open street maps, but then I need postgres, postgis, a tile server and styles and apache running just to generate the tiles. Is there anything portable (short of running osmand in an android virtualbox) for offline navigation on a linux pc? QGIS can display vectors, but I wasn't able to easily style the data... navigation is a no-go there too. anything else?