Introduction the role of VOR/DME — The demands of the air traffic control system for navigation services

Electronic engineers enjoy devising new navigation systems, and fascinating improvements to existing ones, but they are generally far removed from the practical operating problems of aviation. They think the world will beat a path to their door to implement the most recent brainstorm. They are generally oblivious to the economic implications of their “little improvements.” They carefully avoid describing their systems' capabilities in ways which are understandable to the pilot and usable by the designers of routes and obstruction protection. In short, they don't give you a straight answer, they complicate everything. Even when they offer a practical improvement they qualify it with so many ifs and buts that the advantages become doubtful.