| 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 |
EN 