Patent ID: 7030780

Claim:
A method for displaying aircraft positions, comprising: displaying a terrain apparently in three dimensions on a display screen based on topographic data corresponding to an air space under air traffic control; finding three-dimensional positions of respective aircraft based on position data and altitude data of the respective aircraft contained in air traffic control information obtained about the air space under air traffic control, and displaying aircraft marks indicating the respective aircraft at positions on the display screen so as to correspond to the three-dimensional positions of the respective aircrafts; finding a distance between two neighboring aircraft, and determining whether the distance between the two neighboring aircraft is shorter than a safety distance; and displaying a surveillance instruction mark apparently in three dimensions on the display screen, the surveillance instruction mark comprising a triangle having three apexes, the three apexes comprising the aircraft marks of the two neighboring aircraft and a point having a specific relationship with the aircraft marks, when it is determined that the distance between two neighboring aircraft found is shorter than the safety distance.