terrain-following system

terrain-following system

terrain-following systemclick for a larger image
The target spot represents the path the aircraft should be following to clear the ground ahead by the required amount and the aiming mark is its present path.
A system that provides the pilot or autopilot of an aircraft with climb or descend signals so that the aircraft will maintain, as closely as possible, a selected height above a ground contour in a vertical plane through the flight vector. The system enables the aircraft to follow closely all ground contours during elevation.