Standards and Specifications

Reference Description Downloads
S-4 Regulations for International (INT) Charts and Chart Specifications of the IHO (English: Edition 4.8.0, October 2018 - Publication date : November 2018)
Reglamento de la OHI para cartas internacionales y especificaciones cartográficas de la OHI (español: Edición 4.8.0, Octubre del 2018 - Fecha de publicación : Octubre del 2018)




 S-4 Associated Documents  (INT 1, INT 2, INT 3):  
  INT 1 Symbols, Abbreviations and Terms used on Charts, Current English version, Ed. 9, 2018)
(see also Maintenance Section and Various)
  INT 1 Símbolos, Abreviaturas y Términos utilizados en las Cartas, (Versión española, Ed. 6, 2018)


  INT 2 Borders, Graduations,Grids and Linear Scales, Ed. 4, 2007 Eng/esp
  INT 3 Use of Symbols and Abbreviations, Ed. 5, 2011 English
  For further information on emerging or changing requirements for nautical charts, please consult the – Nautical Cartography Bulletins  
S-5A Standards of Competence for Category "A" Hydrographic Surveyors (Ed. 1.0.2, June 2018)
Standards of Competence for Category "B" Hydrographic Surveyors (Ed. 1.0.1, June 2017)


  Companion document : Guidelines for the Implementation of the Standards of Competence for Hydrographic Surveyors and Nautical Cartographers Guidelines

Click here for Supplementary Documents/
S-5A Cross Reference Table Template
S-5B Cross Reference Table Template

S-8A Standards of Competence for Category "A" Nautical Cartographers (Ed. 1.0.1, June 2018) English
S-8B Standards of Competence for Category "B" Nautical Cartographers (Ed. 1.0.0, September 2017) english

Companion document : Guidelines for the Implementation of the Standards of Competence for Hydrographic Surveyors and Nautical Cartographers Guidelines


Click here for Supplementary Documents:

S-8A Cross Reference Table Template
-  S-8B Cross Reference Table Template


Guidance for the Preparation and Maintenance of International (INT) Chart and ENC Schemes and Catalogue of International (INT) Charts

Part A - Guidance for the Preparation and Maintenance of International (INT) Chart and ENC Schemes (English: Edition 3.1.0, February 2018 - Publication date: February 2018)





Part B - INTernational Chart Web Catalogue, Associated Webservices and User Manuals) 

IHO International Charting Regions 

INT Charts/ENC Regions Coordinators 

S-12 Standardization of List of Lights and Fog Signals, June 2004 (Corrections to June 2006)


S-23   Limits of Oceans and Seas (1953).  Sheet maps 1, 2 and 3


S-23 Component Documents :
  • World Chart  - Sheet 1
  • Mediterranean  -  Sheet 2
  • Indonesia - Sheet 3
  • Please note: This document, and higher resolution sheet maps, are also available from the IHO, on CD ROM.
S-32   Multilingual Hydrographic Dictionary


S-44 IHO Standards for Hydrographic Surveys (February 2008)
Normas de la OHI para los Levantamientos Hidrográficos (Febrero del 2008)
Especificações da OHI para Levantamentos Hidrográficos (Fevereiro de 2008)
S-49 Standardization of Mariners' Routeing Guides (Ed. 2.0.0. - April 2010)


Ed. 6.1
Specifications for Chart Content and Display Aspects of ECDIS

Ed. 6.1(.1) - October 2014 - With Clarifications up to June 2015

Annex Ato S-52 (IHO ECDIS Presentation Library) 

Edition 4.0(.2) - October 2014 - With Clarifications up to July 2017    



Click here for S-52 Component Documents:
  • Annex A, Addendum - Symbol Library for Use on ECDIS -english (With clarifications to 2017).
  • Appendix 1 - Guidance on Updating the Electronic Navigational Chart, Edition 4.0.0, April 2012 - english

Joint IMO/IHO/WMO Manual on Maritime Safety Information (January 2016)

Manuel conjoint OMI/OHI/OMM sur les renseignements de sécurité maritime (2009)

Manual conjunto OMI/OHI/OMM relativo a la Información sobre Seguridad Maritima (2009)


Appendix 1 List of NAVAREA and Sub-Area Coordinators- Operational points of contact. (see COMSAR Circ 58)

Appendice 1 Liste des coordinateurs de zones et de sous-zones NAVAREA - points de contact opérationnels (Voir COMSAR Circ 58)






S-57 IHO Transfer Standard for Digital Hydrographic Data, November 2000 - Main Document english

S-57 Component Documents:
  • Appendix A - Chapter 1 Object Catalogue (31ApAch1.pdf) -English
  • Appendix A - Chapter 2 Attribute Catalogue (31ApAch2.pdf) - English
  • Appendix A, Annex A - Data Producer Codes - Deleted (replaced with S-62)
  • Appendix A, Annex B - Attributes/Object Classes Cross Reference (31Xref.pdf) - English
  • Appendix B.1 - ENC Product Specification (20ApB1.pdf) - English
  • Appendix B.1, Annex A - Use of the Object Catalogue for ENC - UOC (Ed. 4.1.0 January 2018) - English
  • Annexe A Utilisation du Catalogue d'Objets pour les ENC - Francais
  • Appendix B.1, Annex B - Examples of CRC Coding - English
  • Appendix B.1, Annex C - Recommended ENC Validation Checks - Deleted (replaced with S-58)
  • Appendix B.1, Annex D - INT1 to S-57 Cross Reference ( - English
  • Appendix B.2, IHO Object Catalogue Data Dictionary Product Specification - English
  • Maintenance Document  (See Maintenance Section)
  • For further information on data encoding, please consult the FAQs and - Encoding Bulletins
  • S-57 Supplement No 3 to Edition 3.1 (June 2014 - incorporates the former Supplement No 2) - English
S-58 Ed. 6.1.0

ENC Validation Checks. (S-58, Ed. 6.1.0. September 2018)
[See CL 47/2018 / Voir LC47/2018 ]



S-58 Ed. 5.0.0 ENC Validation Checks. (S-58, Ed. 5.0.0. June 2014)
[See CL 30/2018 / Voir LC30/2018 ]
S-60 User´s Handbook on Datum Transformations involving WGS 84, (July 2003) - Last correction August 2008  english
S-61   Product Specification for Raster Navigational Charts (RNC) (January 1999) english
S-62 List of Data Producer Codes. Current edition.



S-63 IHO Data Protection Scheme (Edition 1.2.0 - January 2015)



S-63 Component Documents

  • Annex A - Data Server Certificate Request Procedure
  • Data Server Agreement - english
  • Data Server Request Form - english
  • Annex B - Manufacturer Information Request Procedure
  • OEM Agreement - english
  • OEM Request Form - english
  • Appendix 1 - Test Data Set - english (zip - 90 Mb)
  • Test definitions and scripts - english
  • S-63 SA Certificate - english
  • ENC Signature Service - User Manual - english

S-63 Guidance Notes - english (Intended to assist OEMs data servers to implement S-63)


Ed. 3.0

See Note ***

IHO Test Data Sets for ECDIS (Edition 3.0.2 - July 2017) English

ENCs: Production, Maintenance and Distribution Guidance (Edition 2.1.0 - May 2017)
Guide pour la production, la mise à jour et la diffusion des ENC (Edition 2.0.0 - avril 2012)
ENCs : Guía de Producción, Mantenimiento y Distribución (Edición 2.1.0, Mayo 2017)




S-66 Facts about Electronic Charts and Carriage Requirements (Edition 1.1.0 January 2018)



S-99 Operational Procedures for the Organization and Management of the S-100 Geospatial Information Registry (Ed. 1.1.0, November 2012) english
S-100 IHO Universal Hydrographic Data Model (December 2018) English
S-1xx IHO S-100 based Product Specifications   
S-101 - ENC Product Specification, Edition 1.0.0 (December 2018 - English) Link
S-102 - Bathymetric Surface Product Specification, Edition 1.0.0 (April 2012 - English) Link
S-111 - Surface Currents Product Specification, Edition 1.0.0 (December 2018 - English) Link
S-122 - Marine Protected Areas, Edition 1.0.0 (January 2019 - English) Link
S-123 - Marine Radio Services, Edition 1.0.0 (January 2019 - English) Link
S-129 - Under Keel Clearance Management, Edition 1.0.0 (June 2019 - English) Link
  A complete list of all S-100 based Product Specifications, including Product Specifications in development and published, is maintained here
Please note: S-101 and S-111 Edition 1.0.0 Product Specifications are released for implementation and testing purposes only.

IHO Registry IHO Geospatial Registry (The IHO registry is an online resource that comprises several registers which contain organised lists of hydrographic related information. Link

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