IHO
International Hydrographic Organization
The IHO is an intergovernmental organization that coordinates the setting of international hydrographic and nautical charting standards. Its Standards and Specifications (S-series) underpin Electronic Navigational Charts (ENCs) and the developing S-100 Universal Hydrographic Data Model used by mariners and maritime software worldwide.
Document Types 5
Components 8
Structured elements that make up a IHO identifier:
Publisher
EnumerationIHO — optional on input, always emitted on output
IHOType Letter
EnumerationSingle-letter series code (S, P, M, B, C)
SNumber
StringDocument number, may include sub-part or slash-year
44Appendix
StringAppendix marker: "Ap." prefix
Ap. APart
StringPart marker: "Part" keyword
Part 4aAnnex
StringAnnex marker: "Annex" keyword
Annex ASupplement
StringSupplement marker: "Suppl" keyword
Suppl 1Version
StringThree-part dotted version (X.Y.Z)
5.0.0PubID Algebra 4
Relationships between IHO identifiers:
| Relation | Description | Syntax | Example |
|---|---|---|---|
| Part | Subdivision of a standard | IHO [Type]-[Number] Part [Part] [Version] | IHO S-100 Part 4a 1.0.0 |
| Appendix | Appendix within a publication | IHO [Type]-[Number] Ap. [Letter] [Version] | IHO S-65 Ap. A 1.0.0 |
| Slash Year | Annual revision indicator within a series | IHO [Type]-[Number]/[Year] [Version] | IHO P-1/21 1.0.0 |
| Sub-part | Compound number with sub-part | IHO [Type]-[Number]-[SubPart] [Version] | IHO P-6-3 1.0.0 |