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Made some progress. I was able to open the map PDF using Inkscape, disable all non-relevant elements (map legend, map background) and save it as PNG.
Then used the image calibration tool with a three point calibration, which worked OK.
Managing the calibrated map is pretty difficult, hard to find the relevant menu entries.

Hi all,

I would like to import a large PDF map in LM.

https://zg.ch/dam/jcr:19d1fd92-97e9-41d4-a629-749e2199590f/Karte1_Stand_Mar04_2025_KRB_mitEingaben_IGMTB_A0_red.pdf

How could I do this? I have seen older posts on this topic, but there are still open questions:
First, georeferencing is not a problem. The map containts the map grid, so aligning this with the official map (see https://s.geo.admin.ch/l7f3sogztawu for example) should not be a problem.
Then the question would be how to extract the map itself from the PDF. The background seems to be bitmap (which I don't need as I could overlay them over LM or Swiss maps), but the trails are vectors.
I guess if I would want to extract the map as one single bitmap, it would need to be around 5k-10k pixels wide in order to keep it legible.
Can LM handle single bitmaps that large or would I have to tile it?

Thanks! Martin