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You can get GPS systems that upload data using a SIM. Only viable if you live somewhere with cheap roaming plans. Last I checked, a local company was selling the hardware (without sim) for 200EUR. The thing I was trying to protect was 120-ish.
I'm leaning towards this but which are private?
None, they're all on a cell network so your info is registered with the SIM and the location is tracked by the cell provider, and they share data with the government and others.
Okay, which are libre? Don't want some proprietary app to see it. Need privacy when viewing the data.
In my case I use a GL300MA tracker on the Hologram network, and it sends data to Traccar on my server.
https://www.traccar.org/ could be a good starting point.