Unlike in most other texts of Air Navigation, here the reader will find a combined technical and operational approach, given the background of the author. Meteorology, Aircraft Instruments, Surveillance, Ground and Spaced based navaids, Airspace Management, Air Traffic Flow Management, Air Traffic Services, Safety, Cartography, Area Navigation, IFR Procedure Design, Oceanic Navigation and Aircraft Performance Influence on Air Navigation are the subjects covered along the lines of this book. The book is initially intended for Aerospace Engineering students, but may also be of interest for pilots or air traffic controllers that want to expand their knowledge of the proposed themes.