[amsat-bb] Observations on tracking programs

[Wendy and Terry Osborne]

Hi Folks,

I have recently been following AO-91 with a selection of tracking programs and confirming
the results with observations of the downlink.

Using the same QTH location and Keps, I found the following: 
The AMSAT-NA online tracking page is pretty accurate. See: https://www.amsat.org/track/index.php
Heavens-above.com is also pretty good. See: https://www.heavens-above.com
SatPC32, Orbitron, InstantTrack, and Quiktrak are pretty good and give the same results as the “On-Line” trackers.

Nova is about 5 minutes ahead.
GPredict is about 5 minutes behind.

Has anyone else noticed this?

73,
Terry Osborne ZL2BAC