Good points, thank you for checking it out. R.e. (1), I'm using the default OSM tiles for now, but I do agree that I need some that at least also show the common English place names. R.e. (2), this is a significant weakness of the public data I'm using (ADS-B), though my hope is that trends can still be observed through the activity/anomalous traffic of broadcasting aircraft, even when the active craft are silent.