Web App at http://amsat.org.ar/pass.htm could handle Rotor and Dopplers Does it thru http://amsat.org.ar/pass.exe available for download. Uses WispDDE Driver http://www.mederoscnc.com/CX6DD/wispdde/wispdde.htm If You try, comments/suggestions/changes welcome. 73, lu7abf, Pedro Converso