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ADMIRALTY Notices to Mariners

ADMIRALTY Notices to Mariners are weekly updates that provide bridge crews with the latest safety-critical navigational information. They can be downloaded for free below or purchased as weekly bulletins from your ADMIRALTY Chart Agent.


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The Cumulative List of ADMIRALTY Notices to Mariners (NP234 A/B) can help you to identify outstanding NMs and audit trails for a particular chart or charts. The list is published annually, with Part A in January and Part B in July

The Cumulative List of ADMIRALTY Notices to Mariners is available without subscription from ADMIRALTY Chart Agents. You can view it by clicking on the links below.


NP234(B​) 2​020 

NP234(A​) 2​020 

NP234(B​) 2​019 

NP234(A​) 2​019 

NP234(B​) 2​018 

NP234(A​) 2​018 


Annual Summary of ADMIRALTY Notices to Mariners 2020 (NP247)

To supplement Weekly NMs, the UKHO produces an Annual Summary of Notices to Mariners (NP247). This publication contains the Annual Statutory Notices to Mariners Numbers 1-26, a summary of Temporary and Preliminary Notices to Mariners still in force at the start of the year, and a Cumulative Summary of Amendments to ADMIRALTY Sailing Directions.

The paper version of the Annual Summary of Notices to Mariners is published annually in January, and copies are available by subscription from ADMIRALTY Chart Agents. To access the Annual Summary online, click on the links below.


Annual Notice to Mariners 1-26, 2020

This includes how to find sections which have now been moved into 'The Mariners Handbook'.

An overview of each of the 26 sections 


1 ADMIRALTY Tide Tables 2020 — General Information 

2 Suppliers of ADMIRALTY Charts and Publications 

3 Safety of British merchant ships in periods of peace, tension or conflict  

5 Firing Practice and Exercise Areas 

10 Mine-Laying and Mine Countermeasures Exercises - Waters around the British Isles 

12 National Claims to Maritime Jurisdiction 

19 Global Navigational Satellite System Positions, Horizontal Datums and Position Shifts 

20 Mandatory Expanded Inspections - EU Directive 2009/16/EC 

21 Canadian Charts and Nautical Publications Regulations 

22 US Navigation Safety Regulations Relating to Navigation, Charts and Publications 

23 High Speed Craft 

26 Marine Environmental High Risk Areas 


Temporary and Preliminary Notices 2020

T&P 2020 

Amendments to ADMIRALTY Sailing Directions 2020

Amends to SDs

ADMIRALTY  Notices to Mariners for ADMIRALTY Leisure Folios

Here you will find all relevant ADMIRALTY Notices to Mariners (NMs) released since the publication date of the chart within the leisure range's New Edition. This service is updated weekly and aims to provide you with the best information available to help you navigate safely and effectively. You can be assured that with ADMIRALTY charts you are using the best; they are recognised official standard and trusted worldwide. We pride ourselves on the quality and integrity of our data - no one else promulgates infomation as well or as quickly as we do.

For further information, guidance notes including the printing of blocks, please click here.


Important safety notice:

Unfortunately week 13 Notices to Mariners were not added to the corrections published for ADMIRALTY Leisure Folios in that week. The correct information was published on 14 May 2020. Therefore, if you updated your ADMIRALTY Leisure Folios between 19 March and 14 May 2020, you may have missed these corrections.

These Notices have now been added to the files below. If you updated between the dates above, pleased check the files for NMs in the range L1537/20 to L1675/20 and apply them to your Folios if necessary. We apologise for any inconvenience caused.

ADMIRALTY Leisure Folios

SC5600 The Solent and Approaches​​​​

SC5601 East Devon and Dorset Coast 

SC5602 The West Country, Falmouth to Teignmouth 

SC5603 Falmouth to Hartland Pt incl Isles of Scilly 

SC5604 The Channel Islands 

SC5605 Chichester to Ramsgate and Calais to Oostende 

SC5606 Thames Estuary, Ramsgate to Tower Bridge 

SC5607 Thames Estuary Essex and Suffolk Coast 

SC5608 Bristol Channel 

SC5609 North West Wales including Menai Strait 

SC5610 The Firth of Clyde 

SC5611 West Coast of Scotland 

SC5612 Northern Ireland 

SC5613 Irish Sea - Eastern Part 

SC5614 East Coast - Orford Ness to Whitby 

SC5615 East Coast - Whitby to Edinburgh 

SC5616 Ardnamurchan to Shiant Islands 

SC5617 Fife Ness to Inverness and the Caledonian Canal 

SC5620 South West Wales 

SC5621 Carlingford Lough to Waterford 

SC5622 Ireland - South Coast 

SC5623 Ireland - South West Coast 

ADMIRALTY Notices to Mariners (NMs)

ADMIRALTY charts and publications should be maintained so that they are fully up-to-date for the latest safety-critical navigational information. The ADMIRALTY Notices to Mariners service provides all the data you need to maintain our products.

ADMIRALTY NMs contain all the corrections, alterations and amendments for the UKHO's worldwide series of ADMIRALTY charts and publications. They are published weekly in several formats but best known as the weekly booklets, which are despatched directly from the UKHO.

View the guidance notes for Notices to Mariners here 


Updating your ADMIRALTY charts - a film guide to using Notices to Mariners

The UKHO has produced a series of support films to help you update your ADMIRALTY charts. The films, which are hosted on our YouTube channel, also include a look at some useful tools to help you carry out these tasks.

Watch the support films > 


New Notices to Mariners tracings

Please see our publication 'How to keep your ADMIRALTY Products Up-to-Date (NP294)' 10th Edition, published 1 June 2017 for further information.

View the overview of new Notices to Mariners tracings

View the quick guide to Notices to Mariners tracings 


ADMIRALTY Notices to Mariners Online

The ADMIRALTY Notices to Mariners Online service enables mariners to download NMs directly from this website.

To access NMs Online, select the appropriate tabs on this page.


Searchable NMs Database

The UKHO's searchable NMs database, known as NM Websearch, allows you to search by chart number for NM text, full colour NM blocks and notes.

Access NM Websearch >


Additional Notices to Mariners Services

For the latest information regarding update status of UK ENC cells in relation to UKHO NMs please click here.

In addition to Weekly Notices to Mariners, the UKHO produces the following supplementary NM Publications:

  • Annual Summary of Notices to Mariners (NP247)

  • Notices to Mariners Block Updates

  • Notices to Mariners Tracings

Guidance on how to apply the updates contained within NMs to ADMIRALTY Charts can also be found in NP294 - 'How To Keep Your ADMIRALTY Products Up-to-Date'.

To help you keep a neat and formal record of all the NMs applied to a vessel's portfolio of charts, the UKHO recommends use of Paper Chart Maintenance Record (NP133A)


Pricing of ADMIRALTY Notices to Mariners (NMs)

  • Cumulative List of ADMIRALTY Notices to Mariners (NP234A and NP234B) - £5.70 per copy

  • Annual Summary of ADMIRALTY Notices to Mariners (NP247) (paper version - parts 1 and 2) - £8.40 per copy

  • Notices to Mariners Web Services - Free

  • Searchable Notices to Mariners Web Service - Free


Official Status of ADMIRALTY Notices to Mariners

The ADMIRALTY Notices to Mariners weekly bulletin is published by the UKHO. The UK Maritime & Coastguard Agency (MCA) accepts that both the paper and digital forms of the NM weekly comply with carriage requirement for Notices to Mariners within Regulation of the revised Chapter V of the Safety of Life at Sea (SOLAS) Convention, and the Merchant Shipping (Safety of Navigation) Regulations, both of which came into force 1 July 2002.


Reproducing ADMIRALTY Notices to Mariners

ADMIRALTY Notices to Mariners (NM) are British Crown Copyright; resale of all or parts of the NMs is prohibited without written permission from UKHO. To apply for permission, please contact: Please note that permission will only be granted subject to completion of an assessment.

We've licensed companies to issue updates for our products direct to vessels at sea through ADMIRALTY Chart Agents. These electronic couriers, or Value Added Resellers (VARs), supply correction datasets tailored to a vessel's portfolio of ADMIRALTY charts and publications. The datasets are derived from the ADMIRALTY digital files on our website.

The electronic courier services help ship owners and masters to manage their chart and publication folios and comply with the International Safety Management Code.

These companies are licensed to deliver ADMIRALTY Notices to Mariners on our behalf:

​American Nautical
B Cooke & Son Ltd
Boat Books Australia Pty Ltd
Bogerd Martin (Hong Kong) Ltd
C & C Marine Combine
CAIM (Cooperativa per Azioni Armamento Imprese Maritime)
Chart Track
ChartWorld International Limited
​Chersoft Ltd
Da Gama Maritime Ltd
Datema Delfzijl BV
​David Store Navigation 
​E W Liner Charts & Publications
​Easy Marine
​Guangzhou Haining Maritime ServiceN/A​
Harri Trading BV
Hong Yunn Sea Professional Company Limited
Maritime Services
Maryland Nautical Sales Inc.
Millenium Marine Services EPP
Motion Smith
​NAVICO Norway AS (C-MAP Update Service)
Navtor AS
​OneOcean (Canada) Inc
​OneOcean Group Limited
Plymouth Sea Chest Limited
Poseidon Navigation Services Ltd
​Qija Voyage
SEEKARTE Kapitän A. Dammeyer GmbH & Co. KG
Shanghai Ocean Nautical Supply CompanyN/A
​Shenzhen Goldsailocean Navigation Article Co LtdN/A​
South Bank Marine
Suisca SL
Sweethigh Navigation Technology
Todd Chart Agency Limited
Tyneside Nautical Charts & Publications
Vanos S A
​Voyager Worldwide - A Global Navigation Solutions Limited Company
​Voyager Worldwide -Yasden Denizcilik AS Company
​​Voyager Worldwide - A Safe Navigation Inc