I adapted this solution that projects crs3912 map to leaflet(crs 3857 if I'm correct) to node.js app that allows me to load this map into applications like Global Mapper, OruxMaps or such. However, zoom and map placement is off place.
I found that the tile https://c.tile.openstreetmap.org/15/17795/11679.png geographically corresponds to this geopedia tile, which when converted to decimal would be
This map goes only till the zoom level 9 where the jpg files are already pixelated, so last usable level is 8.
My question is, simplified, when z/x/y coordinates requested from navigation app are for example 15/17795/11679 how do i get this tile, how to adapt coordinate system and zoom for this to usable in mentioned applications.