The introduction of a wide-area multilateration (WAM) network in the North Sea is a prime example of how new surveillance technologies are driving the latest transformation in air traffic management. In 1990, U.K. controllers considered it a major breakthrough when offshore rebroadcasting stations allowed them to talk to helicopters servicing North Sea oil rigs. Now, thanks to WAM, controllers can also see these aircraft on their displays far beyond land-based radar range—something that ...


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