This book provides information on all phases of air navigation. It is a source of reference for navigators and navigator students. This text explains how to measure, chart the earth, and use flight instruments to solve basic navigation problems. It also contains data pertaining to flight publications, mission planning, in-flight procedures, and low-level navigation. A glossary of references and supporting information used in this publication is at Attachment 1 mathematical formulas to use as an aid in preflight and in-flight computations are at Attachment 2 chart and navigation symbols are at Attachment 3 and a subject index is at Attachment 4. Contents Maps and Charts Mission Planning Basic Instruments Dead Reckoning DR Radio Aid Fixing Map Reading Radar Navigation Celestial Concepts Computing Altitude and True Azimuth Celestial Precomputation Plotting and Interpreting the Celestial Line of Position Special Celestial Techniques Sextants and Errors of Observation Grid Navigation Pressu