I was QSOing with Paul KD9IAO on the way home tonight and we started talking about our Raspberry Pi's and what we were doing with them. Paul has a couple of Pi 2B's and a 3B, and I have a trio of the 3B models. Paul told me about a very interesting application he was running to track satellites so he knows when the ISS flies over and the time is right to try a QSO. The program he is using is called Gnome Predict, or gpredict in the software library.
You can add this application to your Raspberry Pi by clicking on the Raspberry, choosing Preferences, and then clicking on the Add/Remove Software option. Type in gpredict and your Pi will go out on the internet and pull down version 1.3 of Gnome Predict.
Once the software installs you open the preferences and input your location information and ASL altitude.
Now you are all set!
Give this app a try, I think you'll like it. I have also been using my Raspberry Pi 3B as a Shortwave Receiver, thanks to http://websdr.org and the online receiver community. It's amazing what you can do with this little $35 small board computer!
73 de KB9BVN