> the last problem now is, that the surface lox is in a different coordinate 
> system than the caves (EPSG:31468 vs. lat-long) :/ I hoped loch would 
> recognize this and recalculate as appropriate, but that was not the case. Is 
> there some option to convert conveniently?

Is it not straight forward use Therion to recompile either the surface or the 
caves?

Regardless of the input cs, you can specify the output cs in the thconfig file. 
 For example I always have this section in my thconfigs...

#SPECIFY OUTPUT COORDINATE SYSTEM
#=================================
# Recommended if you have one or more coordinate systems defined in source 
surveys or surfaces
# Often required if you also export to atlas
# Choose coordinate systems that are relevant to the cave locations!

# cs EPSG:2193  #NZ Transverse Mercator 2000
 cs EPSG:27200 #NZ Map Grid 1949

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