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Submitted on: 23 March 2008.
Revised on: 11 July 2008.
Accepted on: 06 September 2008.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
Submitted on: 18 December 2008.
Revised on: 09 April 2009.
Accepted on: 31 May 2009.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS
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Submitted on: 29 August 2008.
Revised on: 04 November 2008.
Accepted on: 31 December 2008.
___________________JOURNAL OF NAVIGATION---CAMBRIDGE UNIV PRESS