The latter development has effectively rendered all previous air navigation methods obsolete, and as a result, the occupation of 'air navigator' has now passed into history...
Sad though this may be, it presents the opportunity to write a definitive history of the subject.
And nobody could be better qualified to do so than the Royal Institute of Navigation, whose journal has published articles on air navigation since its earliest days.
Drawn from this unique knowledge resource, this book contains contributions from some of the most knowledgeable experts in the world, including pioneers such as Sir Robert Watson-Watt, making it an invaluable and unique reference work.