Glossary of Terminology and Acronyms


Co-operation Arrangement.

IC-ENC focuses its co-operation activities around a multi-lateral arrangement known as the IC-ENC Co-operation Arrangement.
The purpose of this CoA is to provide a framework for strengthening international co-operation between HOs in the production, quality assurance, promotion and distribution of ENC data. The CoA also defines the terms of reference of the IC-ENC Steering Committee and its various working groups in which signatories to the CoA are entitled to participate.


'Commercial Off The Shelf' software.

Software that is commercially available to all organisations and as such will provide a comparable environment for ENC production and validation purposes.​


Digital Information Portrayal Working Group.

A working group which strives to maintain the IHO Publication S-52. This publication includes IHO specifications for colours, symbols and display rules used to show SENC information on ECDIS in a safe and ergonomic manner. DIPWG also maintains the portrayal elements of IHO Publications S-100 and S-101, as well as the Portrayal Register of the Geospatial Information Infrastructure. ​​


Data Management Database.

IC-ENC’s uniquely developed in-house database. The DMD holds all ENC data sent by IC-ENC members, and provides IC-ENC with a low cost and consistent way of storing ENC data, as well as a central working point for the IC-ENC validation team.


Data Protection Scheme Working Group.

A working group with the primary objective of developing and maintaining an IHO ENC data protection scheme known as S-63. ​


E​lectronic Chart Display and Information System.

An ECDIS is an electronic chart (ENC) based navigational system that complies with IMO regulations and can be used for navigational purposes in lieu of paper charts. ​​


Errors Data Base.

A database of validation tool error messages ​used by the IC-ENC validation team during ENC validation, and also for IC-ENC members during ENC production and internal validation processes. Each database entry includes detailed error information including the cause, impact and solution. The Errors Database can be accessed via the IC-ENC website. ​


E​lectronic Navigational Chart.

An electronic chart is a real-time navigation system that integrates a variety of information that is displayed and interpreted by the Mariner. ​

ENC Reissue

A regenerated New Edition file that contains updates to a certain point in time. This can save time when loading multiple updates into an ECDIS, as the updates are included within the New Edition file, rather than separate update files. 

End User Licence Agreement.

An End-user Licence Agreement issued through or by IC-ENC for and on behalf of a Supplier Nation. ​

Exchange Set

An exchange set is a grouping of data sets in a logical, consistent and self-contained collection to support the interchange of geospatial data and meta data. 


Hydrographic Services and Standards Committee.

A technical steering committee of the HO which aims to promote and coordinate the development of standards, specifications and guidelines for official products and services to meet the requirements of ariners and other users of Hydrographic information. ​


International Centre for Electronic Navigational Charts. 

IC-ENC is a Regional ​ENC co-ordinating centre (RENC). It is has offices in the UK and Australia and is responsible for validating its members ENCs and positioning them in the market place through a selected group of Value Added Resellers (VARs).


I​nternational Hydrographic Bureau.

The IHB is the Secretariat of the IHO and is located in Monaco. ​


I​nternational Hydrographic Organisation.

The IHO aims to create a global environment in which marine navigation information is provided in a timely and usable manner in order to support and protect the marine environment. ​


International Maritime Organisation.

The IMO is the United Nations specialized agency with responsibility for the safety and security of shipping and the prevention of marine pollution by ships. ​​​


Inter Regional Coordination Committee.

The Inter Regional Coordination Committee aims to promote and coordinate activities that might benefit from a regional approach, such as capacity building, training and implementation of policies related to the WEND. All matters are identified as strategic objectives of the IHO​.

Issuing Authority

​The official agency which issues the ENCs and ENC updates validated to comply with the relevant standards and quality requirements.​


Joint Technical Experts Working Group.

The JTEWG is a joint subsidiary of the Primar Advisory Committee (PAC) and the IC-ENC Steering Committee (IC-ENC SC). The JTEWG co-operates with the goal of increasing the efficiency, quality and availability of consistent ENC data to the market. ​


Meso American and Caribbean Seas Hydrographic Commission.

A Hydrographic Commission which allows coordination of Hydrographic activity and cooperation at the regional level. ​


O​riginal Equipment Manufacturer.

In the case of ENCs, an OEM is specifically the manufacturers of the ECDIS hardware.


PRIMAR Advisory Committee.

A similar committee meeting to the IC-ENC Steering Committee, whereby policies are strategies are decided upon. ​


Pay As You Sail.

 A new and innovative service developed to allow the distribution of authorised ENC data under certain terms and conditions, and documented by a certificate. ​


PRIMAR is a non profit RENC operated by the Norwegian Hydrographic Service that provides a validation and distribution service to its members. ​


Regional ENC Co-ordination Centre.

A RENC is a not-for-profit organization that is controlled by the Member States who distribute their ENCs through that RENC.

RENCs ensure that all the ENCs that they handle are consistent. The RENCs also make ENCs available to retailers from a single wholesale source. RENCs are part of the official supply chain for ENCs.​​


RENC Harmonisation Steering Group.

A group, jointly chaired by the IC-ENC Chairman and PRIMAR Chairman, which strives to harmonise the activities of the two RENCs.


​Regional Office.

A sub-office of IC-ENC that is concerned with providing validation and production support services to IC-ENC members in that region.


Real Time Reporting.

 New IC-ENC functionality which will mean that Standard Subscriptions are reported to IC-ENC within 24 hours of sale, and PAYS subscriptions are reported within 72 hours of first usage. ​


​S-57 is the IHO standard for the exchange of digital hydrographic data.  It has been used almost exclusively for encoding Electronic Navigational Charts (ENCs).​


Steering Committee

An annual meeting in which IC-ENC members come together to discuss the strategic issues, agree policies and to set the budget for the following year. ​

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