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Published online by Cambridge University Press: 21 October 2009
A number of studies have been carried out by consultants on behalf of the General Lighthouse Authorities (GLA) to assess the effectiveness of aids to navigation systems and to study the effects of changes to these systems. The usefulness of graphical representation of aids to navigation systems was appreciated and a program was developed for a desktop computer, combining graphics with numerical analysis of effectiveness. The program has been used in two studies for the GLAS, the results of which are used here to illustrate the techniques involved.