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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
Ok - thanks! If you need to record your GPS trace then there's always GPS recorder.
For now, I have just removed the Kalman filter - so if you update it should all work again. At least it seems to from everything I can see at the moment.