Abstract
In 1967 the Hydrographer of the Navy, guided by a report from his professional advisers and with the support of many chart users with whom the main proposals were discussed, took a number of decisions to modernise the Admiralty Chart. The author heads one of the sections of the Nautical Chart Branch; and this paper, which follows lectures given to the Society last year, examines the factors of changing navigational requirement on the one hand and of cartographic opportunity on the other which have led to the new policy. A number of practical limitations imposed on cartographic expression in marine charts are outlined.

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