1 · Site & sectors
Take the coordinates with GPS on the ground, away from the structure — or pass them in from Navigator as a URL parameter.
Downtilt is optional — leave it blank and the sector is judged on azimuth only. Positive = tilted down.
Default assumes the phone lies flat on the back of the antenna, screen facing away from it. Tilt is read from gravity — no calibration needed, and it does not drift.
3 · Zero calibration
Hold the phone upright. Line the vertical crosshair up exactly on the point you picked on the map. When the indicator reads "Steady", tap Calibrate.
Method: relative gyroscope + geodetic offset. The magnetometer is not used — tower steel and 5G antennas cannot disturb the measurement. The only enemy is slow drift — re-calibrate every few minutes.