Domanda 334, Radio Navigation - ATPL - Airline Transport Pilot license

3 satellites with an azimuth of 120° from each other and an elevation of 45° above the horizon
4 satellites with an azimuth of 90° from each other and a low elevation above the horizon
3 satellites with a low elevation above the horizon and an azimuth of 120° from each other together with a fourth directly overhead
Main control station, the monitoring station and the ground antennas