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Different HOs have different approaches to the production and distribution of T&P notices; thus, dependent on each national HO, they may:

A ship’s response to these will depend on which HO has produced the ENCs in use on board the vessel. The United Kingdom Hydrographic Office (UKHO) publishes a helpful list of HOs and their stance in relation to T&Ps/ECDIS.

The problems associated with T&Ps (and ECDIS) have not gone unaddressed. The UKHO has responded with a product for Admiralty Vector Chart Service (AVCS) customers called the Admiralty Information Overlay (AIO). The AIO comes in the form of an additional display layer, which when selected by the user, indicates the areas affected by Admiralty T&Ps. Details of the T&P notice can be obtained via pick report by interrogating the affected areas, which are marked with hatched areas known as ‘polygons’.

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The ease with which objects can be applied to an ENC varies between ECDIS brands. Regardless, applying manual corrections to an ENC is a retrograde step, which will hopefully be eliminated over time.

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Officers should determine whether the HO which produced their ENCs also produces and distributes T&P notices. If so, they should confirm that they produce T&P notices for ENCs in addition to paper charts. If T&P notices are not produced for ENCs, they will need to be inputted manually using the information contained in the paper T&P notices to mariners.

The third approach is the most troublesome for the digital navigator, ie T&Ps produced for their paper charts but not for their ENCs.

These variations of approach from the different HOs have created understandable confusion amongst officers. In fact, many officers are unaware that they may be using ENCs which do not contain T&P notices.

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To facilitate this, each brand of ECDIS is designed to allow users to input ENC objects and text. This process needs to be approached in a similar manner to that of paper chart corrections. The individual T&Ps need to be applied accurately to the appropriate cells and records kept. Expired T&Ps will need to be deleted.

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Before using AIO, users need to be aware of its various characteristics and any considerations which need to be taken into account. AIO considerations:No OverlayWhere conflicts of scale occur between UKHO products and the areas covered by T&Ps, AIO will display ‘No Overlay’. In such circumstances, AIO users should gather information from other sources, such as local Notices to Mariners to determine whether there are any relevant T&P notices.ENC Preliminary Notices to Mariners AIO also includes ENC P (EP) notices. Unlike the traditional NTMs and T&Ps, this type of notice is unique to ECDIS and is not carried over from paper charts. EP notices concern navigationally significant differences between paper charts of the BA chart series and the related AVCS ENCs. EP notices, whilst relatively new, are an important consideration for digital navigators.In addition to the UKHO’s efforts, other, commercial organisations have addressed the issue. One such service, ChartWorld Information Overlay+ (CIO+), provides navigators with T&P information in a user chart layer.ConclusionUntil all HOs include T&P data in their ENCs, it will be necessary for mariners to keep a close eye on their ENCs and apply manual updates where necessary. Admiralty Information Overlay and ChartWorld Information Overlay + (CIO+) offer digital navigators greater visibility of T&Ps, but each system has its own unique set of user considerations. Companies should ensure that their personnel are sufficiently knowledgeable on the subject of ENC updates/T&Ps and the particulars of any product they use.This article was originally published by the Standard Club in Standard Safety.“It has been over 30 years since the Herald of Free Enterprise disaster. In that time, many of the safety issues faced on board ships have remained constant, some have improved, and some new risks have emerged. In this edition of Standard Safety we reflect on certain pressing issues faced by members of the club, reflecting the emerging risks or demonstrating a new way to tackle an old problem.” Read more here.

ECDIS was designed to improve safety and ease the workload of navigators. One activity which has burdened navigators since the invention of paper charts is that of chart corrections. ECDIS could have eliminated this task entirely because updates to Electronic Navigation Charts (ENCs) are applied automatically and can be date dependent. Standard ENC updates are applied easily via digital media, but the situation regarding Temporary and Preliminary Notices (T&Ps) is more complex.

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Officers correcting paper charts were free to use bold annotations to ensure the visibility of T&Ps and draw the OOW’s attention to them. When T&Ps are included in ENC data, they are applied as a standard update, but with a date dependent attribute (a valid to/from date). Unfortunately, T&P updates are not always obvious to the user. An ECDIS route scan will only detect the presence of a T&P (within the cross-track corridor) if it has a danger attribute. If there is no danger attribute, the T&P will not appear in the route scan report.

T&Ps and digital navigation Prior to ECDIS, officers plotted T&Ps on paper charts in pencil and retained information on valid/current T&Ps on the bridge. This meant that the officers of the watch (OOW) were aware of any T&Ps which the vessel may have encountered whilst on passage, provided the list of T&Ps had been kept up to date using the weekly notices to mariners.