I agree the explanation can be better. Also the link to the source code was wrong since I move it to Switzerland.
Skychart-3.1-1232 refer to a development version available from the page: http://www.ap-i.net/skychart/en/development_version Get the file skychart-3.1-1321-windows.exe Download the example Catgen project: https://svn.origo.ethz.ch/skychart/trunk/tools/cat/ucac3/ucac3_catalog.prj Run skychart and open catgen. Click the button "Load project" and select the file ucac3_catalog.prj Now all the parameters are set except the file path that refer to the location on my computer. Click the button "Catalog Files" to select all the 360 3uc* files. Click Next until the last page is show. Change the "Output directory" Click "Build catalog" This must work with all the files at a time, the /work partition I use is 40GB and I put there both the u3conv result and the final catalog. Patrick
