ADMIRALTY Notices to Mariners (NMs) are designed to help you update your ADMIRALTY Standard Nautical Charts (SNCs) and ensure they contain the latest safety critical information.
Our NM tracings are a key part of this service as they allow you to quickly pin-point the position of any updates and accurately apply them to your nautical charts. On 10 July we released a new tracing style that will make these updates easier to understand and apply to your portfolio of charts.
How have the latest Notices to Mariners Tracings changed?
We have changed the way we present updates on the tracing itself. For example, all information that needs to be inserted will now be shown in its exact position, rather than appearing in a box and arrowed in. Below we've included examples of these changes.
All information that needs to be deleted will be shown with double strike through alongside a deletion symbol. Previously this information may have been boxed or hatched.
An example of information that needs to be deleted
All information that needs to be inserted will now be shown in its exact position on the tracing in relation to the chart. Previously this information was boxed, with its position shown as a small circle with a dot at the centre.
An example of information that needs to be inserted
Replace or Amend
Any new features will now be shown in its true position on the tracing and will be accompanied by the words 'in lieu'. Previously any information that needed to be amended would have featured a double strike though with new information arrowed 'in lieu'.
An example of information that needs to be replaced or amended
Any information to be moved will be shown in its new position with an arrow drawn from its existing position.
An example of information that needs to be moved
To help you recognise these new notations and use the new tracings, we have updated our 'How to update you Standard Nautical Chart' support films to include the latest tracing styles, as well as guidance on chart correction best practice.
Watch our 'How to update Standard Nautical Charts (SNCs) films >
We also have a number of guidance documents that are available on the SNC page support tab and our Maritime Safety Information pages. These include the Quick Guide to the Notices to Mariners Tracings and our overview of the latest tracing changes.
Download the Quick Guide to the Notices to Mariners Tracings >
Download our overview of the Notices to Mariners Tracings >