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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
Is RX connected to TX and vice-versa? Always worth checking :)
However I've noticed that some GPS modules don't output anything at all until they get a lock - so it might be worth leaving the GPS in a window for 10 minutes just to make sure?
Otherwise maybe detach the RX and TX wires and put a scope (or even just a LED) on them to see if any data is being sent?