Chapter 11 Communication and Navigation Introduction With the mechanics of flight secured, early aviators began  the tasks of improving operational safety and functionality of  flight. These were developed in large part through the use of  reliable communication and navigation systems. Today, with  thousands of aircraft aloft at any one time, communication  and navigation systems are essential to safe, successful  flight. Continuing development is occurring. Smaller, lighter,  and more powerful communication and navigation devices  increase situational awareness on the flight deck. Coupled  with improved displays and management control systems,  the advancement of aviation electronics is relied upon to  increase aviation safety. Clear radio voice communication was one of the first  developments in the use of electronics in aviation.  Navigational radios soon followed. Today, numerous  electronic navigation and landing aids exist. Electronic  devices also exist to assist with weather, collision avoidance,  automatic flight control, flight recording, flight management,  public address, and entertainment systems. 