Plain English Meaning

A computer-drawn picture on the cockpit screen that shows the hills, ground, and runways around the aircraft as if it were a clear day, even when the pilot can't see outside.

Full Definition

A cockpit display technology that generates a computer-rendered, three-dimensional image of the outside world on a primary flight display, using a database of terrain, obstacles, and runways combined with the aircraft's GPS position and attitude data. The image shows the pilot what the surrounding terrain would look like through the windshield, regardless of actual visibility conditions.