In Northern Europe it is rare to see two consecutive days when the weather is perfect for flight without reference to instruments. If a pilot wants to operate in the greatest variety of weather conditions and airspace, he must be capable of interpreting the instruments and must know and understand the procedures that have been...

This is a completely re-worked and fully updated edition of the standard text on radio aids. It introduces the theory required to operate and use the VOR, ADF, RMI and DME. The text has been re-written to make it compliant with the latest practices and regulations and also includes new and improved diagrams and illustrations d...