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Additional layer (S-57 format, S-63 encrypted) to ENCs

Relevance of information overlay services and their status in the global IHO ENC programme (IRCC6-08b). AIO (Admiralty information overlay) service. Additional layer (S-57 format, S-63 encrypted) to ENCs Available through AVCS and on compatible equipment

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Additional layer (S-57 format, S-63 encrypted) to ENCs

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  1. Relevance of information overlay services and their status in the global IHO ENC programme(IRCC6-08b)

  2. AIO (Admiralty information overlay) service • Additional layer (S-57 format, S-63 encrypted) to ENCs • Available through AVCS and on compatible equipment • Contains all Admiralty T&P NMs and provides additional preliminary information that is specific to ENCs : EP NMs • such as reported navigational hazards that have been incorporated on paper charts but not yet been included on ENCs • Displayed as a red-transparent area with an associated window

  3. Exploratory assessment study: • (Conducted on a limited number of AIOs) • Not all T&P SHOM NtMs appear as AIOs • Some AIOs don’t correspond to SHOM NtMs • Some AOIs are unnecessary, as ENCs they refer to are already updated • Some AIOs refers to several ENCs, but some of them should not be concerned • Some AIOs don’t reproduce exhaustively NtMs from the producer • => Although the objective of AIO is to improve the quality of ENCs for the interest of the navigator, the issues it can generate could create doubts on reliability of official charts and on the quality of IHO ENC service.

  4. On the relevance and status of AIOs: • On 53 IHO MS producers of ENCs, 41 issue NtMs for their paper charts and 30 (6 more intend to do it before 2015) issue ENC revisions to cover them • => AIOs should not be necessary for them • When new information is reported in paper charts but not in ENC, how can the navigator determine which is the good information? • It should be solved in advance rather than highlighted in AIOs • AIO is not a IHO nor IMO official product compliant with IHO standard

  5. On the relevance and status of AIOs: • If AIO is considered by IHO offering a real advantage for safety of navigation that can not be achieved by a better application of rules already existing or to be improved, then: • AIO should be encouraged, • AIO should be interoperable with all type approved systems • Responsible States should be informed as soon as possible of the additional information. • If not (risks exceed advantages): • Procedures should be agreed and applied between AVCS producer and IHO ENC producers so AIO should not be necessary

  6. Conclusions and recommendations: • Priority should be given to ensure mariners do not face ambiguities in the global IHO ENC service (risk of mistrust about official ENCs, final users may raise the issue to IMO level) . • Stakeholders should be invited to consider the need for AIO • A guidance should be provided by IRCC and HSCC, for assessment by DQWG or/and WENDWG

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