Does GAP Include Elevation Correction?

There are many posts about GAP and altitude, but I can’t tell whether GAP includes a basic altitude correction or just considers gradient or elevation change.

Is GAP correcting pace to sea level? For example, if I run at 5000 feet on level ground, will GAP be faster than Pace?

GAP uses speed and the ‘active’ elevation stream. If you have no elevation correction enabled, it uses the default ‘altitude’ stream. Else it uses the ‘Fixed Alt’ stream (which is equal to altitude if there’s no altitude correction).
I don’t think that any GAP stream or field exists for altitude corrected speed (as in way above sea level). They do exist for Power (w:alt and w:alt acc streams)

Is Elevation Correction only available for supporters? I tried looking everywhere and couldn’t find a way to enable it or anything related to it for that matter.

@CarlyRunJepsen In Timeline Tab choose Actions>>Settings then: