JohnLietzke
 Captain
Flight distance : 3125968 ft
United States
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AirSense is based on the ADS-B protocol. Here is the United States all commercial aircraft are required to have it and according to the FAA over half of all personal, private and small aircraft have be equipped with ADS-B. Many metropolitan areas require aircraft in the United States to be equipped with ADS-B to enter the AirSpace.
In Europe only about 80% of commercial aircraft have ADS-B, in addition the mandate for ADS-B for commercial aircraft has been postponed 3 years. Very few personal, private and small aircraft are equipped with ADS-B and there has been delays on laying out a timetable for mandatory adoption.
The issue of Europe not having ADS-B is two fold. First, ADS-B is only useful if aircraft have the transponder. The aircrafts that are actually relevant to drones using ADS-B are personal, private and small aircraft. Second, the signal frequency used for ADS-B (1090mhz) in Europe is experiencing congestion and further regulatory intervention is need to eliminate non-essential use of the frequency. Also, DJI is required to get special certification for ADS-B from the European Union regulatory agencies and from each country. This has created barriers to implementation of ADS-B in Europe. Here is a link to the SESAR Deployment Manager website for the European Union for more information and future reference.
I live in an area where all aircraft except the Military are required to have ADS-B. Often there are low flying small aircraft that are just above the 500ft required height or that have received authorization from the FAA to fly below 500ft. In addition there is helicopter traffic from emergency services, medical flights and other business that fly below the 500ft height limit to clear airspace or to takeoff and land. I have found ADS-B to be helpful for small aircraft and helicopter as some aircraft have been as low as 250ft and flown in areas where the FAA has given automated clearance to drones using LAANC.
As KlooGee pointed out there are a lot of irrelevant notification that appear for commercial aircraft near the airport or flying over that are 10,000+ ft.
As for the Military aircraft, which in my case there are a significant number everyday due to the proximity to 3 Military Airfields, I have very little concern about capabilities of the pilot and durability of the aircraft. The Military F series fighters, Ospreys and helicopters, primarily BlackHawk variants and Chinooks, are so loud and can be heard miles away that there is ample time clear the area for them.
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