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Published online by Cambridge University Press: 21 October 2009
It is generally acknowledged that the present terrestrial radio-navigation facilities are in need of updating. Furthermore, satellite navigation offers great potential benefits to all classes of user. One of the factors to be taken into account is cost, and with this in mind it would be useful to establish how much the present spectrum of terrestrial radio-navigation aids itself is costing and what it provides for the money. This is a difficult task which has been attempted before. Each attempt makes a dent in the armour of impenetrability that is inherent in the problem. This paper adopts a fresh approach which it is hoped may make a dent slightly greater than some of the others.