The contents of Notices to Mariners (NMs )
We studied about the concept of Marine Navigation Charts, and the correction of charts used on ships in our previous articles. The weekly Notices to Mariners contain, amongst other information, individual notices (not to be confused with the NM itself). A NM is broken up into the following sections:
• Section I – Explanatory Notes and list of Publications
• Section II – Geographical Index
Index of Affected Charts: matches chart numbers affected with notice
Corrections to Charts: individual notices to be used in chart correction.
Temporary and Preliminary notices in force at time of publication of NM
• Section III – Reprints of Navigational Warnings (in force)
• Section IV – Amendments to Admiralty Sailing Directions (not for charts)
• Section V – Amendments to Admiralty List of Lights (not for charts)
• Section VI – Amendments to Admiralty list of Radio Signals (not for charts)
Sections IV through VI are used for correcting other Admiralty publications in use on board and not charts. Some of these publications are the List of Lights and fog signals, Sailing Directions, Admiralty list of Radio Signals etc. There are hundreds of such publications on board, depending on the trade of the ship and the voyages she is likely to make.