An aircraft synthetic vision display system comprising: a topographical database (106, 108, 110, 112) comprising topographical information relating to an airport, the topographical information comprising at least: runway identification, runway position, runway length, and runway width data relating to the airport, obstacle height, obstacle location and obstacle distance data, and terrain profile and terrain elevation data; a global positioning system receiver that receives a satellite signal from a global positioning satellite to determine a geographical position of the aircraft; a ground-based augmentation system receiver that receives a ground-based signal from a ground-based transmitter associated with the airport, wherein the ground-based augmentation system receiver receives the ground-based signal from a local area augmentation system associated with the airport, wherein the ground-based signal comprises a very-high frequency data broadcast signal, wherein the VDB signal comprises: (i) VDB message Type 4 information comprising final approach segment information associated with an approach to a runway at the airport, and (ii) information used to define a reference path leading to a runway intercept point; a computer processor adapted to retrieve the topographical information from the topographical database based on the geographical position of the aircraft, adapted to retrieve the VDB message Type 4, adapted to validate the topographical information using the VDB message Type 4 information, and adapted to correct the topographical information using the VDB message Type 4 information to generate corrected topographical information; and a display device adapted to render three-dimensional synthetic imagery of environs of the aircraft based on the corrected topographical information, the three-dimensional synthetic imagery comprising a corrected graphical rendering of the runway position at the airport, a corrected graphical rendering of obstacle positions in the vicinity of the airport, and a corrected graphical rendering of terrain. a topographical database (106, 108, 110, 112) comprising topographical information relating to an airport, the topographical information comprising at least: runway identification, runway position, runway length, and runway width data relating to the airport, obstacle height, obstacle location and obstacle distance data, and terrain profile and terrain elevation data; a global positioning system receiver that receives a satellite signal from a global positioning satellite to determine a geographical position of the aircraft; a ground-based augmentation system receiver that receives a ground-based signal from a ground-based transmitter associated with the airport, wherein the ground-based augmentation system receiver receives the ground-based signal from a local area augmentation system associated with the airport, wherein the ground-based signal comprises a very-high frequency data broadcast signal, wherein the VDB signal comprises: (i) VDB message Type 4 information comprising final approach segment information associated with an approach to a runway at the airport, and (ii) information used to define a reference path leading to a runway intercept point; a computer processor adapted to retrieve the topographical information from the topographical database based on the geographical position of the aircraft, adapted to retrieve the VDB message Type 4, adapted to validate the topographical information using the VDB message Type 4 information, and adapted to correct the topographical information using the VDB message Type 4 information to generate corrected topographical information; and a display device adapted to render three-dimensional synthetic imagery of environs of the aircraft based on the corrected topographical information, the three-dimensional synthetic imagery comprising a corrected graphical rendering of the runway position at the airport, a corrected graphical rendering of obstacle positions in the vicinity of the airport, and a corrected graphical rendering of terrain.