What are the methods for updating charts on board?

What are the methods for updating charts on board?

The amendment and updating of nautical charts is an ongoing process. Once issued, navigational features, aids or other relevant information must be issued continuously to provide the latest information for ships sailing in these areas.

Maritime Notices to Mariners (also known as "weekly notices") are used to amend and update nautical charts and are provided to ships in electronic or paper form.

The various methods for updating and maintaining the chart system on board include:

These notices are issued weekly by the Maritime Department and include chart amendments, as well as other publications such as the Maritime Department Navigation Guide and the Maritime Department List of Lights and Radio Signals. They also include interim and preliminary notices of chart amendments. Each year begins with Notice No. 1 issued in the first week of January, and the numbering increases chronologically until the last week of January.

Notices also report the publication of new maps or new versions, as well as the cancellation of previous versions.

Corrections are listed as coordinates and instructions or as cut-and-paste overlays and tiles. New editions of the Admiralty Lighthouse and Fog Signal Tables, Navigational Guides and Radio Station Lists will be available as they become available.

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Cumulative List of Notices to Mariners

This list is published twice a year in January and July and its main purpose is to provide a list of the current editions of all Admiralty charts, together with the serial numbers of the relevant Notices issued in the previous two years. It can be verified that the charts on board have not been corrected by comparing the charts with the cumulative list.

Annual Summary of Notices to Mariners

All temporary and preliminary notices from the previous year are published together in the Annual Summary of Notices to Mariners. This document provides a quick and practical reference for identifying temporary and permanent chart corrections. It also contains a summary of course corrections.

Chart Correction Software (Charts)

The printed version of the weekly Notices to Mariners is digitized using chart software. The software connects to a chart correction service provider, organizes the charts on board into a database, and inserts the corrections received onto the respective charts. Mariners can access the system using the chart number, print and apply any specific correction or all corrections that apply to any chart on board.

Offline databases and software are used on boar,d and correction information is attached as an attachment to weekly mailings. These two software programs are used to keep the chart correction database updated as well as the printed version of the weekly NOTAM.

NOTAM:

NOTAMs are issued to ships sailing in different areas. The world is divided into 21 navigation areas, and these notices are broadcast through the World NOTAM Service. Through a network of regional coordinators and national coordinators, important international, coastal and local navigational warnings and advisories are sent to ships, which receive these messages through very high frequency (VHF), high frequency/medium frequency (HF/MF) radio frequencies and satellite networks.

NAVTEX Notices:

These notices are broadcast through radio stations located in different coastal areas. They mainly transmit maritime, aerial, and distress warnings. They play a key role in coastal navigation warnings. Ships' NAVTEX receivers are used to receive navigational warnings. For example, in December 2004, NAVTEX stations took the lead in sending tsunami-related distress and emergency warnings to fishing and commercial vessels operating in the Indian Ocean and adjacent coastal areas.