RESTORING NAVIGATIONAL PERFORMANCE FOR A NAVIGATIONAL SYSTEM

A method 100 of restoring navigational performance for a navigational system 30, 32, the method 100 comprising receiving by a first navigational system 30 and a second navigational system 32 a collection of data points 34 to establish a real-time navigational route 48 for the aircraft, comparing navigational performance values and/or drift ranges 50 and establishing a new navigational route 58 based on the collection of data points 34.