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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.
user139491
@Gordon
On Bangle.js 1 there was a running app that let you upload a route and it'd point you along that route - so that could definitely be done.
But the navigation in the video was sent from the phone via Google Maps (and the plan is also to support OpenStreetMap)