Lantmäteriets Fjällkarta (Swedish mountain map) reprojected to WGS84 as a "Tiled web map" for Guru Maps-app, OpenStreetMap and Google Maps.
Guru Maps makes in easy to zoom and pan seamlessly in tiled web maps. It also saves all downloaded tiles for offline use.
The app can be found for iOS here and for Android here.
To add a custom map source, open the map source Lantmäteriets Fjällkarta for Guru Maps in the browser on the device and select "Open in Guru Maps". Many other map sources can also be found here: https://git.beroni.us/custom-map-source/.
The complete map is available as one 400 MB file for offline use. Open the file Lantmäteriets Fjällkarta for Guru Maps in the browser on the device and select "Open in Guru Maps".
A map overlay for Google Maps for desktop or mobile browsers can be found here: Lantmäteriets Fjällkarta for Google Maps
The map can also be found as a "Super Overlay" for Google Earth here: Lantmäteriets Fjällkarta for Google Earth
Read about tiled web maps on Wikipedia.
The Perl-script is a one-time batch job that reprojects coordinates, downloads map images, transforms perspective and composits them. ImageMagick is used for image processing. The output from the script can be found using the links above, no need to run the code to view the map.
The original mountain map is no longer available, but information from it can be found on the newer topo-map at: Min Karta