There should be a designated chart supplier or service provided on a timely basis without delays to supply new charts and new editions applicable to the folios onboard.All the charts and publications are to be corrected on weekly basis following instructions provided in weekly notices to mariners and the correction numbers to be entered in the same index mentioned above against chart numbers respectively, so that it can be used as a quick reference to check status of corrections for any chart The chart correction log should have details of all charts present onboard with index of corrections (temporary and preliminary also) mentioned against each chart number.The following points to be considered in order to maintain updated chart folio onboard: Photo by arnphoto/depositphotosĪn updated and corrected chart folio system comprises of Chart correction Log and Folio Index, Admiralty Chart catalogue, Admiralty Sailing Directions, Weekly Notices to Mariners, Annual Summary of Notices to Mariners, Admiralty List of Lights, Admiralty List of Radio Signals, Admiralty Tide tables, Chart – 5011 Symbols and abbreviations to be used on charts. The Catalogue of Admiralty Charts and Publications is published every year with current and updated editions of charts, however, if during the year the Weekly Notices to Mariner indicate any new editions or new charts, they are to be inserted in the chart catalogue by the navigating officer. Insertion of a New Traffic Separation Scheme not present on the previously used chart, the Admiralty then publishes a New Edition of that chart replacing the existing one. However if there are major changes in a chart or large amount of data is to be inserted for e.g. Whenever a new area is to be added to a chart or it has to represent an area different from the previous chart, or the depth units shown on previous charts have to be changed or if the scale on which a previous chart was made has to be renewed, then Admiralty publishes a New Chart.
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