Ask HN: Is there a fitness wristband that is hackable?
Amazfit Pace [1]I just bought one for ~£80 from Gearbest and you can pull the GPX routes from it, and also add routes.  You can access all of the files, by plugging a USB lead into the charging dock.  It then appears as a USB drive that you can copy files to and from.  I've designed my own watch face, as it's just XML and image files and taken GPX data.  I'm not sure how or if you can get the heartrate or pedometer data but there is a community on XDA [2] around it so they might be able to help.The thing that I'm most impressed by is the screen.  It is a transreflective display which means that it is always on and just uses the latent light for you to be able to see it, much like a black and white LCD.  It does have a backlight, but you only need to put this on when it is dark and you actually need to see the display - much like watches used to be.1.  https://us.amazfit.com/shop/pace?variant=251122.  https://forum.xda-developers.com/smartwatch/amazfit