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Nautical chart
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== Publication == Nautical charts are issued by power of the national [[hydrographic office]]s in many countries. These charts are considered "official" in contrast to those made by commercial publishers. Many hydrographic offices provide regular, sometimes weekly, manual updates of their charts through their sales agents. Individual hydrographic offices produce national chart series and international chart series. Coordinated by the [[International Hydrographic Organization]], the international chart series is a worldwide system of charts ("INT" chart series), which is being developed with the goal of unifying as many chart systems as possible. There are also commercially published charts, some of which may carry additional information of particular interest, e.g. for yacht skippers.
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