Navigation system is the eyes of an airplane and it can provide parameters about position, speed, heading for pilots or automatic pilot. Airborne navigation devices are the necessary devices for takeoff, line, emergent flight or landing, displaying techniques are developing from index, number and symbol interface to integrated displaying interface with two-dimensional map or three-dimensional scene. According to the actuality and development of aero navigation display technology, this article analyses the assist navigation technology, functions and advantage for a new chart Device, and shows the future direction of displaying techniques for navigation information.