My garmin GPS shows a Rate of Decent needed to get the airport/waypoint selected as the destination.
This is useful to know when to start descending or what rate of descent is needed, or choosing when to start descent to match rate of descent wanted.
An equivalent available as an on-screen would be awesome.
For me, the rate of descend should be to "circuit height (1000ft)" for airports/runways etc, rather than ground (height of waypoint), but can live without if to ground..