making a change to the GPS recorder app

Ok, great! For developing widgets there's actually a small tweak needed: https://www.espruino.com/Bangle.js+Widgets#trying-in-an-app

Open Settings,Communicationsand changeLoad after savingtoLoad default application`

So basically you want the IDE to save your widget, but then not to load it automatically each time you upload but instead just load your default app (the clock) which will then load the widget.

In terms of the updates, I don't always update the bangle app loader immediately, but there's a development version at https://espruino.github.io/BangleApps/ which always has the latest from GitHub (albeit sometimes with a few minutes lag because of GitHub cacheing)