The S-100 Standard is a framework document that is intended for the development of digital products and services for hydrographic, maritime and GIS communities. It comprises multiple parts that are based on the geospatial standards developed by the International Organization for Standardization, Technical Committee 211 (ISO/TC211).

The latest edition (Edition 4.0.0) of the S-100 Standard can be downloaded here .

The video below provides more information about S-100 and dependant Product Specifications currently under development.

S-100 Maintenance Schedule

The IHOs S-100 Working Group (responsible for maintaining the Standard) recognizes that the standard must evolve in order to cater for new user community requirements and has developed a planned revision cycle for the Standard. User communities are invited to submit proposals for corrections and/or extensions to the standard, for inclusion in the next planned edition. The S-100 planned publication schedule is provided below. Submissions should be sent to the S-100WG Secretary (addt(at)iho.int) in accordance with S-100 Part 12 - Maintenance Procedures

Month/Year Action Notes
March/April 2020 Final Consideration of proposal for next edition
May 2020 Notification to HSSC12 of a new edition of S-100
Early 2021 Publication of the next edition of S-100

Proposals for Clarifications, Corrections and Extensions to the S-100 Standard document should be submitted to the S-100 Working Group using this proposal form

Other Associated S-100 Resources

Type Description/Link Edition/Date Comment
S-100 S-100 Edition 4.0.0 Schema packages - Readme November 2018 See below
S-100 S-100 Edition 4.0.0 Schema packages November 2018 See Readme - above
S-100 S-100 UML Model April 2017 S-100 Github - download
S-100 S-100 UML Model - HTML Version September 2018 HTML version of the UML models
S-100 S-100 Schemas February 2018 S-100 Github
S-100 S-100 Master Plan Document (June 2015)

Allocations of S-100 Dependent Product Specification Numbers

In order to manage the development of S-100 based products; and with a view to minimizing duplication and encouraging conformity, the IHO Hydrographic Services and Standards Committee (HSSC) allocates S-XXX numbers to be used for the development of S-100 dependent products. The following Product Specification numbers have been allocated by the HSSC:

International Hydrographic Organization (IHO) (S-101 to S-199)

  • S-101 Electronic Navigational Chart (ENC)
  • S-102 Bathymetric Surface
  • S-103 Sub-surface Navigation
  • S-104 Water Level Information for Surface Navigation
  • S-111 Surface Currents
  • S-112 Open - (See Decision HSSC9/38)
  • S-121 Maritime Limits and Boundaries
  • S-122 Marine Protected Areas
  • S-123 Marine Radio Services
  • S-124 Navigational Warnings
  • S-125 Marine Navigational Services
  • S-126 Marine Physical Environment
  • S-127 Marine Traffic Management
  • S-128 Catalogue of Nautical Products
  • S-129 Under Keel Clearance Management (UKCM)
  • S-1xx Marine Services
  • S-1xx Digital Mariner Routeing Guide
  • S-1xx Harbour Infrastructure
  • S-1xx (Social/Political)

International Associateion of Light Authorities (IALA) (S-201 to S-299)

  • S-201 Aids to Navigation Information
  • S-210 Inter-VTS Exchange Format
  • S-211 Port Call Message Format
  • S-230 Application Specific Messages
  • S-240 DGNSS Station Almanac
  • S-245 eLoran ASF Data
  • S-246 eLoran Station Almanac
  • S-247 Differential eLoran Reference Station Almanac

Intergovernmental Oceanographic Commission (IOC) (S-301 to S-399)

Inland ENC Harmonization Group (IEHG) (S-401 to S-402)

  • S-401 IEHG Inland ENC
  • S-402 IEHG Bathymetric Inland ENC

Joint Technical Commission for Oceanography and Marine Meteorology (WMO/IOC JCOMM) (S-411 to S412)

  • S-411 JCOMM Ice Information
  • S-412 JCOMM Weather Overlay
  • S-413 Weather and Wave Conditions
  • S-414 Weather and Wave Observations

International Electrotechnical Commission - Technical Committee 80 (IEC-TC80) Numbers (S-421 to S-430)

NATO Geospatial Maritime Working Group (GMWG) for Additional Military Layers (AML) Numbers (S-501 to 525)

Other Resources


The IHO has endeavoured to ensure that the information on this website as accurate as possible but cannot take any responsibility for it.

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