Patent ID: 7046170

Claim:
An electronic display for graphically indicating actual navigational performance (ANP) for an aircraft relative to required navigational performance (RNP) under an RNAV flight condition, said display comprising: a RNP symbol, comprising a band having a length with an indicator centrally positioned therealong, the indicator representing a centerline of a required flightpath and the length indicating a magnitude of the required navigational performance; and an ANP symbol, comprising a band having a length with an indicator centrally positioned therealong, the indicator representing the course of the aircraft and the length indicating a magnitude of the actual navigational performance; wherein a shape of the ANP symbol corresponds to a shape of the RNP symbol, the RNP symbol represents the RNP requirements for said aircraft, and the ANP symbol partially overlaps and moves relative to the RNP symbol on the display to depict lateral displacement of said aircraft relative to the required flightpath.