Patent ID: 8718931

Claim:
A method for cross checking required navigation performance procedures, the method comprising: executing a required navigation performance procedure, the required navigation performance procedure generated in a flight management system in an aircraft, the procedure comprising navigation information for the aircraft from a first global positioning system signal received in the flight management system through a first path, executing the required navigation performance procedure includes the use of data from a local navigation database; receiving an independent global positioning system signal in an independent data processing system located onboard the aircraft, the independent global positioning system signal received from a path independent of any positioning signal received by the flight management system; presenting a current position of the aircraft based on the independent global positioning system signal on a moving map; cross checking, on the independent data processing system, the navigation information for the required navigation performance procedure determined by the flight management system with the current position of the aircraft determined by the independent data processing system, the cross checking performed while the aircraft executes the required navigation performance procedure, the current position of the aircraft determined by the independent data processing system includes the use of data from a local chart database, the local chart database different from the local navigation database; and displaying a set of containment lines on the moving map to indicate whether deviations from the required navigation performance procedure have occurred.