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Published online by Cambridge University Press: 23 November 2009
In the above article (published in this Journal in May 1997), it was mentioned that the work undertaken was carried out by the UK Civil Aviation Authority (CAA) Institute of Satellite Navigation (ISN). It should be added that the second of the two projects was sponsored by the UK CAA National Air Traffic Services (NATS) in conjunction with the Defence Evaluation Research Agency (DERA) under contract Project Boscombe.