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Published online by Cambridge University Press: 18 January 2010
No satisfactory means of securing positive identification of individual radar echoes in congested waters has yet been devised, although many ingenious suggestions have at different times been put forward. These ideas include systems for providing a special identification signal from selected buoys, or alternatively for a considerable increase in the number of buoys and their arrangement in groups in definite patterns at strategic points so that they may be easily picked out on the ship's P.P.I.
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