I've gone through the INSTALL and README docs and made lot of english corrections as well as fixed a few typos and other things that were less than clear. I hope I haven't incorrectly changed the meaning of anything. I'll send the new files and diffs to stacho to avoid clogging up the list. I've now understood the therion syntax and data structures in basic form and have converted a survex centreline dataset to Therion (which now processes without error with therion), but I am completely unable to use xtherion to do any drawing or create th2 files. ( A perl script to do this would be extremely useful as it is currently a very bording process). I might do this at some point. I need some clues about how to start. If I go to 'map editor' and click file->new I get 'Error unknown option -state' - not sure how serious this is. But how do I draw some lines round my survey? How do I get scans in to copy? How do I get the centreline in to draw around? It is impossible to start without some idea about how to do these basic things, or at least some explanation of the principles of operation of xtherion :-) Wookey -- Aleph One Ltd, Bottisham, CAMBRIDGE, CB5 9BA, UK Tel +44 (0) 1223 811679 work: http://www.aleph1.co.uk/ play: http://www.chaos.org.uk/~wookey/