Unfortunately, the Kandelin card has a PDA without fields, where you cannot see the fields and their numbers.
The modder created a map with recognizable fields and their numbers.
After downloading the ZIP file, copy or move the file to the following directory:
C:\Users\YOUR NAME\Documents\My Games\FarmingSimulator2022\modSettings\FS22_RealGPSMod\Kandelin
And in the Kandelin folder you unzip the ZIP file. So there should be 2 files in the map folder.
overview.dds RealGPS_config.xml
If this is the case, realGPS extracts the map preview from this folder and no longer from the map.
Have fun with whoever needs it.