I just experienced quite an error in my tracking program which is the HRD SatTracker. I have downloaded the keps and do everyday. I was waiting for ISS and AOS time arrived and my program tracked it. I was showing it almost at LOS and still heard nothing. As I was parking my antenna to retire, I heard the APRS signal and was able to copy it in UISS. For some reason, I am off by at least 3 mins. As I write this and observe the map on this site it shows ISS over North Central Africa; my tracker shows it over Middle Eastern Africa. I must state that I am acquiring and losing all other sats on time and am successfully working through them. Does anyone know what could be happening that I am so far off with ISS tracking?

73,

Carl W8KRF