Paper overlay update#
Paper overlay software#

The UKHO issues a weekly bulletin of Temporary and Preliminary Notices to Mariners (T&P NMs) which contains temporary information of navigational interest to mariners using ADMIRALTY paper charts. Please contact your ADMIRALTY Chart Agent if you wish to use the Overlay or cannot view it on your ECDIS. The AIO permit GB800001 is free of charge for AVCS users and can be added to your licence. The Overlay data is held on a single CD which is installed and updated in the same way as ENCs. Please see the UKHO website for a list of AIO-compatible ECDIS, or consult your supplier.

Paper overlay software#

The Overlay can be displayed on AIO compatible ECDIS equipment as well as some software applications. Included as EPNM if the information is about a navigationally significant difference between the ENC and the equivalent paper chart.Excluded if the information only relates to paper charts and is therefore not relevant to the ECDIS user.Included if it affects an ADMIRALTY paper chart and has been issued as a T&P NM.Excluded if the producer nation confirms that they include temporary information in their ENCs.Temporary information is assessed for inclusion as follows: ContentĮxcept for areas where there is no ADMIRALTY chart at equivalent scale to the ENC (indicated by ‘No Overlay’ polygons), AIO covers the whole world. The AIO also draws attention to areas where differences between ENCs and paper charts may affect the passage plan.

Each polygon carries the same number as the original NM in the ADMIRALTY Weekly Bulletin.

Where the ENCs do not include temporary information, the Overlay contains ADMIRALTY Temporary & Preliminary Notices to Mariners (T&P NMs) that are issued for paper charts. In common with all ENCs, downloaded weekly updates can only be applied to the most recent base edition issued, and must be applied in sequence. The AIO is a single large dataset, so you should work with your ADMIRALTY Chart Agent if you wish to avoid large download sizes by using a disc when you load your ECDIS for the first time or when a New Edition is released. Some back of bridge software applications allow the vessel to download the updates each week. The weekly disc contains the base edition and all the updates, so you only need to load the most recent disc on board.

Paper overlay update#

The AIO is refreshed every week, as part of the AVCS Weekly Update and is issued on disc and by download. The AIO is a worldwide digital dataset that is designed to be displayed over ENCs in ECDIS and other chart display systems to provide additional information during passage planning.