In my program, I check for the presence of a "U" on line1 of a TLE. Vote: Should a "C" be a permissible character in column 9 of line1? I use that character as a validation step in reading in two line elements. Element Manager has been getting some attention lately. Several bugs fixed, the Tracking screen has undergone a rewrite (it's now sizable), and the selection file routines have been cleaned up. There is a Version 1.2.1 available, but I've got a few more changes pending on my hard drive. So you might want to wait for 1.2.2 if you plan to update. http://www.eoss.org/elementmanager/version.htm -- cul -- Rick - N0KKZ