Hardly smoke signals.
It is a smoke signal - from GPS stateliness. It can easily be converted to something systemd understands if you'll create a specialized daemon (in a "true UNIX fashion" people like to preach here so much) which will convert it to signals systemd understands.
And you need such daemon anyway because you need to decide how often you poll, if you use just GPS or if you want to use WiFi, too, etc. It's not as if GPS satellites can pull some trigger on your PC or smartphone which means you'll need some complex logic anyway.
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