Hi all I could really do with some help searching for a problem. In the data http://www.cave-registry.org.uk/svn/CheddarCatchment/ (downloadable svn repository) Trying to run any of the thconfig (well I've tried most) files leads to this error configuration file: LongWoodValley.thcfg reading ... done reading source files ... done preprocessing database ... done therion: error -- automatic declination calculation before 1900 not supported, please specify declination explicitly writing xtherion file ... done This is not a useful error. This data set use to work, I've produced lots of surveys from it. It seems to indicate a date in the error message. Although grep has shown up a couple that I needed to fix for other reasons, none have shown dates before 1900. So I have no idea how to track down this error What else should I be looking for? Running therion with -d does not give any further information Help! thanks Andrew