@pallidex: If you need good prints you could try to find the original Swiss 25k rastermaps and install them om your PC. The Garmin rastermap is exactly the same map. There are several versions on the internet, the original version and others that were converted for Ozi Explorer for instance.
The original is available as torrent:
Spoiler: Swiss topo maps (download torrent) - TPB
The Ozi map can be found here:
Spoiler: Mobilism • View topic - [Multi