This is a feature request. It would be nice to have a varying ring that tells u where u r plane will arrive when descending to set altitude. Real planes have this. Very helpful when navigating in uncontrolled space. Avoids 360s or unnecessarily steep descend, e.g
I like the idea.
Google gives you some calculators that tell you how far away from your destination you should descend. Lock onto the ILS/GPS and it will tell you how far away you are. These can be used together via your brain.