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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
Bangle.js checks ~1 sec after loading the new app to see if GPS is needed, and if not turns it off (so if you're swapping apps GPS stays up)
So just quitting the app will turn the GPS off, no need to reboot!