I’ve done a proof of concept earlier this year. The configuration interface is a bit clunky but it works. It wouldn’t be too difficult to build a proper UI with a map and easier playlist management.
For the demo, an outside server was used running gpsd. Alternatively you could also configure the IP of a router that provided GPS coordinates. Doing everything purely on the Pi is probably possible as well. The main challenge there would be to find a GPS device that just works without complicated drivers or complex user land setup required. I don’t have any experience with that.
Here’s the UI:
