Radio Navigation is an essential element of IFR route flying and a subject in which the prospective Airline Transport Pilot must be proficient. This volume provides the student with the necessary information to pass the JAR ATPL (A) examinations in Radio Navigation and provides a grounding for type rating training and commercial operations. In addition, it takes the prospective ATPL (A) pilot from the basics of wave theory to the practical application of radio aids for navigation and precision/non-precision approaches. The learning objectives for the JAR ATPL (A) examination also include radar principles and their application to ground radar, primary and secondary surveillance radar, and airborne weather radar. With the increasing acceptance of Global Positioning Systems (GPS) as an aid to navigation, there is also a discussion on Global Navigation Satellite Systems (GNSS) and Area Navigation Systems (RNAV).