by Sir Robert Watson-Watt ,
C.B., F.R.S.
The development of air transport has greatly changed the nature of the aids to navigation, and these changes are reflected in corresponding changes In the traditional methods of the mariner
Sir Robert Watson-Watt follows up a recent talk (on October 11) by the Astronomer Royal with a review of the ways in which progress in radio. radar, and electronics generally is affectmg the work of the twentieth-century navigator