I was wondering if it was doable to add a feature calculating the depth from surface based on DEM for each station (and even better: for each splays) and then to display the calculated values as we can do for depth/altitude?
This would help a lot characterizing shallow spot...

Great idea :-)

Great!

If external DEM data can't be called... would it be possible importing a DEM in CRP, i.e. *.GeoTiff format and then use it as a reference?