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The S-63 document describes the IHO recommended standard for the protection of ENC data. It defines security constructs and operating procedures that must be followed to ensure that the IHO Data Protection Scheme is operated correctly. It also provides specifications that allow participants to build S-63 compliant systems.

The Main S-63 Document Description is available in English and French from the Standards & Publications > Download page.

In addition to the main S-63 standard document, the following associated documents are also available from the Standards & PublicationsDownload page.

Annex A - Data Server Certificate Request Procedure

  • Data Server Request Form
  • Data Server Agreement and


Annex B - Manufacturer Information Request Procedure

  • OEM Request Form
  • OEM Agreement

Appendix 1 - Test Data Set


A new IHO Scheme Administrator Certificate came into force on September 1st 2013. This IHO Certificate is available for download here and will expire on February 2033.


S-63 Guidance Notes intended to assist both OEMs data servers to implement the S-63 security system are also available from the Standards & Publications > Download page.

OEMs and Data Servers currently using S-63.
A list of OEMs (Original Equipment Manufacturers) and Data Servers are currently using S-63 to provide an ENC service is available here.