Not involved in any way but this offers a 500ft tracking range and looks better than many non-GPS units.
https://www.kickstarter.com/projects/delmarth/stonetether-the-smallest-tracking-device-at-long-r?ref=category
Good map of places where you really should not be flying drones in the USA. Sadly no support for such info outside NA
https://www.mapbox.com/drone/no-fly/?embed=true#7/35.991/-115.884
