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Drs Ward and Johannessen comment:

Published online by Cambridge University Press:  23 November 2009

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It is not possible from Captain Gyldeń's contribution to fully explain the phenomenon. It is, however, important to note his experience and to encourage other practical navigators to report similar events. It is essential to have the best possible picture of circumstances when GPS suffers problems, before it is decided to close down alternative systems, which might not be affected in the same way.

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Information
The Journal of Navigation , Volume 50 , Issue 2 , May 1997 , pp. 329
Copyright
Copyright © The Royal Institute of Navigation 1997