Three dimensional lateral displacement display symbology which is

Abstract

An aircraft display communicates three dimensional lateral information to a pilot of the aircraft. An extended course centerline symbol and lateral deviation marks indicate lateral deviation from a desired course along with approximate altitude and distance-to-go information to the pilot. The course centerline extends toward a vanishing point near the horizon line of the display. The centerline symbol swings laterally across the display responsive to changes in lateral deviation of the aircraft such that an intuitive perspective view is provided to the pilot. Lateral deviation marks provide precise lateral deviation information to the pilot. The display is adaptable to all phases of flight, but is particularly useful during the approach phase of flight. The preferred embodiment is on a head-up display for instrument flight conditions.