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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
Speedo - mentioned above - would be a good start then: https://banglejs.com/apps/#speedo
It shows 'searching for GPS' in small text while it's waiting for a lock, but then some big numbers for speed when it has one, so it should be pretty obvious.