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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
GPS modules use something called NMEA to communicate. It happens over a standard two-wire serial link. If I'm honest it would be relatively easy for someone skilled to 'fake' a GPS module and the coordinates coming from it - and even if there was an EEPROM accessible on the GPS they could fake that in software too.
Perhaps someone else has some ideas, but I'd say that it would be difficult to 100% know for sure that the coordinates coming from a GPS were genuine.