gpredict, either from PureOS store or with
sudo apt install gpredict in terminal.
Edit Menu > Update TLE Data From Network > Update Transponder Data (Edit: I’m only guessing that this is necessary.)
Edit Menu > Preferences > Modules > Layout (and other desired options)
File Menu > New Module > Create name, e.g.
48275 (NORAD ID of decaying Chinese booster)
Satellites > Search “48275” > Add “CA-5B R/B” > Click OK
Tracking position of Chinese rocket booster in real time (while it’s still up there, at least):
And as a reminder, this also works on the Librem 5, and presumably on the Pinephone. (Needs scaling down a bit.)
I’m not sure why the position doesn’t show on the map at the moment. It’s now missing on my laptop screen, too… And I don’t think the debris has fallen yet! (Edit: Possibly have to add a different ground station…? Default is Copenhagen.)