International Hydrographic Organisation (IHO) S Electronic Navigation . values be recoded to UTF-8 from the character encoding specified in the S57 DSSI. Also known as S The IHO S format is a vector interchange format used for maritime charts. It was developed by the International Hydrographic. Background and introduction; S Data Model; IHO Object and Attributes ‘ International Hydrographic Organization (IHO) Transfer Standard for Digital.

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The standards also provide the procedures for submission of documentation and a complete model syllabus.

M provides specific regulations for the co-ordination and production of INT charts. S57 feature objects are translated into features. Don’t miss the latest developments: For the mariner, this means that data which meets these standards is authenticated and comes from an official source, reducing the risk of using inaccurate data that is posed by unofficial ENCs and the risk of malware being introduced to a ship’s IT systems. Below, we outline what each of the standards mean and why they’re so crucial to safety of ships at sea.

S52 symbols are rendered using a predefined icon per object type, whatever the object attributes are. The Organization began developing standards and guidelines intended for use by the wide community s557 professionals with responsibilities in the fields of hydrography, nautical cartography, safety of navigation and related matters.

IHO S / ENC – Object and Attribute Catalogue

The S57 Reader module produces S57 features in one or more related S57 data files. The default S57 Renderer, uses predefined styles to represent map features through polylines, polygons and small icons.

S, S, S, S — Standards for Electronic Charts S describes the data standard to be used for the exchange of digital hydrographic data generally. Piracy Protection – to prevent unauthorised use of data by encrypting the ENC information. Usually cells contain data for only a subzone of the global catalog zone.


The S57 format is a numerical map format for nautical ijo, which is a standard published by the International Hydrographic Organization IHO.

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It is composed of a single directory containing both a catalog file. Will Blockchain Drop Anchor in Hydrography? Irregularities could include incorrectly intersecting geometry, depths plotted on land or railway tracks appearing in open water.

The presentation library is w57 important part of this standard and ship owners are now expected to update to the latest library 4. Authentication – to provide assurance that the ENC data has come from approved sources.

Selective Access – to restrict access to ENC information to only those cells that a customer has been licenced for. M-3 contains detailed guidance on the composition of nautical publications such as Sailing Directions. This means that what the mariner sees on the screen is displayed in the same way across all approved makes and models of ECDIS. M-3 is the consolidated Resolutions of the IHO. M-4 and M — Standards for S7 Charts M-4 provides the chart specifications for the compilation and presentation of nautical charts issued by charting authorities such as HOs, together with agreed symbols and abbreviations.

IHO standards are compiled and maintained by various Working Groups made up of volunteer representatives from IHO Member States usually from HOstogether with expert contributors representing industry and the various other stakeholder groups. You can igo create your own implementation of the Renderer to display the same S57 data through a different formalism.

The following IHO standards are among the most important. Find more information on www. How Blockchain Will Impact on Navigation. S provides the standard for data protection encryption of ENCs, while S provides specifications and guidance regarding the issuing of ENCs, their display in an electronic chart display and information system ECDIS and their updating.


A configuration file allows you to configure these styles. Standardisation of hydrographic methods and the provision of information is a fundamental part of achieving the IHO objectives. S — Standard for Hydrographic Surveys S sets out the standards required for the execution of hydrographic surveys for the collection of data primarily intended for the compilation of nautical charts to be used for the safety of surface navigation and the protection of the marine environment.


An S57 catalog covers an area with nautical data. S57 geometry objects are automatically collected and formed into geometries on the features.

An S57 dataset can be a directory, in which case all S57 files in the directory are selected, an S57 catalog file, in which case all files referred to from the d57 are selected, or an individual S57 data file. You can find more information at:. Back to all stories.

For example you can specify colors, line styles, icons and even visibility for each feature, based on its S57 code. Within this standard, the S ENC product specification defines how hydrographic offices will construct an Electronic Navigational Chart.

S — Hydrographic Dictionary A permanent working group maintains the IHO Hydrographic Dictionary Swhich now contains almost 7, definitions of words and iyo used in hydrography and associated activities.