The navigation system,which is one of the most important parts of the airplane,can keep the airplane flying safely.But,some parameters of the system,such as the VOR bear,TACAN bear,landing distance and slip line etc,are special parameters which are difficult to calibrate accurately by the common ways.In addition,it is also difficult to be traced to the national standard directly for lack of the highest national standard.Now,we take the Range NAV system for an example to research the characteristics of the c...