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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
Glad you got it sorted.
Phones and internet-connected GPS devices use AGPS (A=Assisted). They use the time and rough location info from mobile phone masts to help them get a fix much faster. Since Bangle.js doesn't have that info it's working from first principles and it can take a while to get a lock - I'd say usually 5 mins does it, but leave up to 10.
After that initial lock, it'll be much faster to get a lock again, even indoors.