Hi,
I'm probably 'reinventing the wheel' here, but I have been using wtracks for a while to make and edit gps tracks. (https://opoto.github.io/wtracks/)
I find that the maps available by default lack detail in mountain areas (place names, DNT cabins, etc.) and have wanted to use the 'topokart' from Statens Kartverket.
I found out today that you can add additional maps via the maps editor (https://opoto.github.io/wtracks/maps.html), then adding the following:
The full url is: //opencache.statkart.no/gatekeeper/gk/gk.open_gmaps?layers=topo4&zoom={z}&x={x}&y={y}
(note: without 'http:' at the beginning)
Alternatively, I think that I have the option of sharing the map that I have added if anyone is struggling with this method.
This map is MUCH nicer for editing tracks in Norway than any of the other options in wtracks.
Again, I appreciate that anybody who is interested in GPS use may have figured this out already, but I thought that I would share in any case
-George