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Notices to Mariners (NtM) are corrections to nautical charts and publications. NtM only contain information which is vitally important to safety at sea. Mariners are obliged to keep their products up-to-date with NtM until a new edition is issued. NtM only apply to editions in force.

To correct a chart, look up the number of the chart in the index at the front of the NTM, by the chart number there will be a list of all the corrections that relate to that chart. Each correction is given a number to identify it. You then need to look up the correction to discover the details.

Chart corrections for paper and digital charts and publications are issued through Notices to Mariners by the Canadian Coast Guard. These notices also contain updates to CHS and Canadian Coast Guard publications, and more.

What is the procedure to correct charts that have not been corrected for the past 2 or 3 years? Check the current edition of the chart. If the latest edition is not available onboard, then request for the new edition.

From start up-Menu (on the left bottom section in chartco), click on Corrections. Click on ENC (top bar) and corrections (Right side bar). This list will show you the pending corrections to your active cells. Click on the ?Collect and transfer to ECDIS? at the bottom of the screen.

Nautical charts are issued by power of the national hydrographic offices 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.

Updated nautical charts are obviously important to provide navigation safety to all end users. In this case, it's highly unlikely that a major accident would have occurred without the chart update. However, it's important that users have faith in the reliability and accuracy in publicly provided products and services.