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Published online by Cambridge University Press: 18 January 2010
Much of Captain Wylie's note (this Journal, 27, 111) is undoubtedly correct, particularly the part headed ‘automatic versus manual’, which restates the strong operational requirement for automatic plotting. The earlier part, however, contains some truth, some error, and shows a notable omission. A detailed analysis would take far too much space, so I will deal with three points only.