A drone fence tool. Set your takeoff point and fence radius, get the governing FAA ceiling for the area and the exact numbers for DJI Fly's Safety settings, then track your own position against the fence while you fly.
Questions, bugs, or ideas: email pearcityguitars@gmail.com and put "Fencekeeper" in the subject line. I read everything.
Fencekeeper tracks this phone, not the aircraft. Ceilings are feet AGL from the FAA's public UAS Facility Map, fetched live. TFRs are not shown, and LAANC authorization through an approved provider (such as Aloft) is still required in controlled airspace.