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The use of radio as an aid to navigation is a matter for continual discussion within the Royal Institute of Navigation, and it is the subject of fresh papers in almost every issue of our Journal. Two notable presidential addresses by the second holder of the office, Sir Robert Watson-Watt, in the early 1950s surveyed separately the air and the shipping industries and, as was proper from one so directly associated with the origins of radar, made close reference to this form of navigation aid.