At present therefore the only guaranteed source for T&P information is paper Notices to Mariners (NM) bulletins from national Hydrographic Offices providing local information or those, such as the UK (through Admiralty Notices to Mariners), providing a worldwide service.
The UKHO has also recognised that the lack of consistent, worldwide, T&P information is a significant problem for mariners and, as an interim measure, is including all Admiralty T&P NMs in its ‘Admiralty Information Overlay’.
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This allows the limits of the T&P NMs to be displayed as an overlay to ENCs in the Admiralty Vector Chart Service (AVCS) by compatible display systems.
In this way the navigator gains easy access to both the location and content of T&P NMs during the passage planning process.
The IHO has recognised this as an issue and has tasked one of its technical working groups to develop solutions.
In addition the IHO has issued a new version of ENC Production Guidance’; this should help ENC producers standardise the way in which this kind of information is encoded.
However it is important to remember that it is necessary to download new editions when they become available because they will contain important new information; later updates can not be loaded until the New Edition is installed.