Abstract: A piloting aid system for displaying symbols representative of determined characteristics of the flight of an aircraft and representative of its environment is disclosed. The symbols are displayed on the screen of a display unit which displays a symbol representing the aircraft near a predetermined point on the display screen and a rectangular window for guiding the flight path of the aircraft. The sides of the guidance window are parallel to mutually perpendicular axes provided on the screen. The abscissa and ordinate of the predetermined point are respectively proportional to the drift and to the slope relative to the ground of the aircraft flight path.