I have recently purchased Satspy for Windows from Acappella Publishing, after trying the shareware version. I would recommend this program for the following features: 1. An excellent file utilities subprogram which allows manipulation similar to " inputtle.exe", and makes the combination of various tle files easy. It also permits the conversion of two-le to three-le easy. 2. This program will process an unlimited number of sats, and can be filtered according to a wide variety of element/observer paramaters. 3. Display of track predictions for a given site and time is fast and easy. The tracks can be displayed as either ground or starfield. 4. A nice feature is "multitrack"- in which all predicted tracks for a given time span can be displayed against a star background. 5. Satspy also prints out an excellent hardcopy for each pass prediction with a convenient section to record your observations. 6. Satels can be easily analysed by groups formatted according to sat #, magnitude, age of els, etc. This "review" is only my opinion, and I have neglected mentioning a few trivial items. I would welcome email regarding this program. Steve Bolton