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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
I can't speak to the real accuracy of GPS but I think the Ublox modules are pretty good as long as you give them time to get a bunch of satellites.
The Espruino WiFi uses the ESP12 module as well, and I've tried to keep the PCB area around the aerial pretty clear so you should get about the same range off of that.
As before though, I can't really give you any accurate range figures - you'd just have to do some testing. I think WiFi does tend to use much higher signal strengths though so it should be much better.