The Fenix and Fenix 2 had an app named "GPS tools". It showed you the signal strength of individual satellites, where they were in the sky, and the accuracy in meters. Nowadays all that information is hidden under a colorful user-friendly interface, and can't be accessed by the ConnectIQ API. All you get to see is overall GPS signal quality - but that's not nearly as cool as the old GPS tools.
I'd like to see that cool stuff back on today's watches. In the least, as a feature on a future Fenix 7. If that's something you'd like to see as well, help by submitting the idea here!