Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO - Edition 4.9.0 - March 2021

Oct 26, 2026

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Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO, Edition 4.9.0 (March 2021), sets out the rules and technical chart specifications governing international hydrographic chart production. The publication defines the structure into Parts A–C covering INT chart regulations and specifications for medium/large-scale and small-scale charts, respectively. It describes update and amendment procedures, including how changes are denoted by new editions, revisions, and clarifications, and specifies required statements for reproductions and translations.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages452

Reading Time18 h 59 min

AccessFree to download

Preface

Publication structure (Parts A–C and sections)

Development, maintenance, and update procedures

Change notation and records of updates

Reproduction, translation, and copyright statements

S-4 Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO Edition 4.9.0 – March 2021 (Publication date: April 2021) Published by the International Hydrographic Organization 4b quai Antoine 1er Principauté de Monaco Tel: (377) [93.10.81.00](93.10.81.00) Fax: (377) [93.10.81.40](93.10.81.40)[ ](93.10.81.40)[info@iho.int](info@iho.int)[ ](info@iho.int)[www.iho.int](www.iho.int) © Copyright International Hydrographic Organization 2021 This work is copyright. Apart from any use permitted in accordance with the Berne Convention for the Protection of Literary and Artistic Works (1886), and except in the circumstances described below, no part may be translated, reproduced by any process, adapted, communicated or commercially exploited without prior written permission from the Secretariat of the International Hydrographic Organization (IHO). Copyright in some of the material in this publication may be owned by another party and permission for the translation and/or reproduction of that material must be obtained from the owner. This document or partial material from this document may be translated, reproduced or distributed for general information, on no more than a cost recovery basis. Copies may QRW EH VROG RU GLVWULEXWHG IRU SURƂW RU JDLQ ZLWKRXW SULRU ZULWWHQ DJUHHPHQW RI WKH ,+2 Secretariat and any other copyright holders. In the event that this document or partial material from this document is reproduced, translated or distributed under the terms described above, the following statements are to be included: “Material from IHO publication [reference to extract: Title, Edition] is reproduced with the permission of the IHO Secretariat (Permission No ……./…) acting for the International Hydrographic Organization (IHO), which does not accept responsibility for the correctness of the material as reproduced: in case of doubt, the IHO’s authentic text shall prevail. The incorporation of material sourced from IHO shall not be construed as constituting an endorsement by IHO of this product.” “This [document/publication] is a translation of IHO [document/publication][name]. The IHO has not checked this translation and therefore takes no responsibility for its accuracy. In case of doubt the source version of [name] in [language] should be consulted.” 7KH ,+2 /RJR RU RWKHU LGHQWLƂHUV VKDOO QRW EH XVHG LQ DQ\ GHULYHG SURGXFW ZLWKRXW SULRU written permission from the IHO Secretariat. III INTERNATIONAL HYDROGRAPHIC ORGANIZATION REGULATIONS OF THE IHO FOR INTERNATIONAL (INT) CHARTS AND CHART SPECIFICATIONS OF THE IHO PART A REGULATIONS OFTHE IHO FOR INTERNATIONAL (INT) CHARTS SECTIONS 100-600 PART B CHART SPECIFICATIONS OF THE IHO MEDIUM AND LARGE-SCALE NATIONAL AND INTERNATIONAL (INT) CHARTS (SCALES LARGER THAN 1:2 MILLION) SECTIONS 100-600 PART C CHART SPECIFICATIONS OFTHE IHO SMALL-SCALE INTERNATIONAL (INT) CHARTS (SCALES 1:2 MILLION AND SMALLER) SECTIONS 100-500 Published by the International Hydrographic Organization 4b quai Antoine 1er Principauté de Monaco Tel: (377) [93.10.81.00](93.10.81.00) Fax: (377) [93.10.81.40](93.10.81.40) E-mail: [info@iho.int](info@iho.int) [Web: www.iho.int](Web: www.iho.int) Edition 4.9.0 March 2021 S-4 Page intentionally left blank V PREFACE The publication S-4 (previously M-4) ‘Regulations of the IHO for International (INT) Charts and Chart 6SHFL¿FDWLRQV RI WKH ,+2􀀏 LQFOXGHV􀀝 􀂇 3DUW $􀀝 µ5HJXODWLRQV RI WKH ,+2 IRU ,QWHUQDWLRQDO 􀀋,17􀀌 &KDUWV¶ 􀂇 3DUW %􀀝 µ&KDUW 6SHFL¿FDWLRQV RI WKH ,+2 IRU 0HGLXP􀀐 DQG /DUJH􀀐VFDOH 1DWLRQDO DQG ,QWHUQDWLRQDO 􀀋,17􀀌 &KDUWV¶ 􀂇 3DUW &􀀝 µ&KDUW 6SHFL¿FDWLRQV RI WKH ,+2 IRU 6PDOO􀀐6FDOH ,QWHUQDWLRQDO 􀀋,17􀀌 &KDUWV¶ 7KH WKUHH 3DUWV RI 6􀀐􀀗 DUH IXUWKHU VXEGLYLGHG LQWR 6HFWLRQV GHDOLQJ ZLWK VSHFL¿F WRSLFV􀀑 5HJXODWLRQV DQG 6SHFL¿FDWLRQV UHODWLQJ WR SDUWLFXODU WRSLFV PD\ EH IRXQG HLWKHU E\ WKHLU VXEMHFW PDWWHU LQ WKH &RQWHQWV SDJH DWWKH EHJLQQLQJ RI HDFK 6HFWLRQ􀀏 RU E\ UHIH

FAQs

What is the purpose of S-4 and what does it cover?

S-4 sets regulations for International (INT) charts and the corresponding IHO chart specifications. It provides the structured rules for how INT charts and their technical specifications are defined and maintained.

How is the publication structured across Parts A, B, and C?

Part A covers the regulations for INT charts. Part B covers chart specifications for medium and large-scale national and international (INT) charts, while Part C covers chart specifications for small-scale INT charts.

How are updates and amendments to Edition 4.9.0 handled and indicated?

Procedures for correcting and updating are described, including how new editions, revisions, and clarifications are denoted. The update record at the beginning of Parts A and C and at the beginning of each Part B section summarizes the changes.

Oct 26, 2026

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