Verify coordinates, altitude, time zone and system time.
Satellites, location and pass prediction
Check observer location, minimum elevation, orbital-data freshness and long-range prediction uncertainty.
Check whether minimum elevation is filtering the pass.
Refresh orbital data and confirm the NORAD ID.
Use fresh orbital data for near-term tasks; predictions are estimates.
Accuracy and safety
Pass results depend on orbital data, location accuracy and time. Follow local radio rules and keep an independent way to stop or power down moving equipment.