Circular Letters 2025
| Reference | Title |
| CL29 | Call for Member States to declare in which Regional Hydrographic Commission (RHC) they wish to be counted for the purpose of determining the number of seats allocated to each RHC in the IHO Council. |
| CL28 | Approval of IHO Resolution - Maximizing Active Participation in IHO Events |
| CL27 | IBSC Implementation of Subject recognition of the S-5A and S-5B Standards - New Guidelines and FAQs issued |
| CL26 | Publication of the Annual Report of the IHO for 2024 |
| CL25 | 2025 Recipient of the Ex Abyssis ad Alta – IHO Award for Hydrographic Excellence 2025 |
| CL24 | Announcement of the 12th ABLOS Biennial Conference - Doha, Qatar 7-8 October 2025 |
| CL23 | New IHO Member Stae - The Commonwealth of the Bahamas |
| CL22 |
IHO Project Empowering Women in Hydrography - Survey on the percentage of women employed in Hydrographic Offices and in leadership roles. |
| CL21 |
Adoption of Edition 6.2.0 of S-44 – IHO Standards for Hydrographic Surveys |
| CL20 |
IHO Resolution - Maximizing Active Participation in IHO Events - Call for Approval. |
| CL19 |
IHO Project Empowering women in Hydrography - Shom (FRANCE) Hydrographic Training - Selection of candidates |
| CL18 |
GEBCO Sub-Committee on Undersea Feature Names (SCUFN) - Call for nomination of IHO-affiliated member |
| CL17 |
IHO CANADA S-100 International Sea Trial Area - Call for Registration. |
| CL16 | IHO - Nippon Foundation GEOMAC Project – Successful nomination of candidates for the 17th Course |
| CL15 |
The EX ABYSSIS AD ALTA – IHO Award for Hydrographic Excellence - Call for Nominations. |
| CL14 | New IHO Member State - The Republic of The Gambia. |
| CL13 |
IHO-IOC Nippon Foundation / GEBCO Training Project - Call for Applications for 22nd Graduate Certificate in Ocean Mapping. |
| CL12 |
Category “B” Nautical Cartography Programme sponsored by the Republic of Korea (16 June - 31 October 2025) Selection of Candidates. |
| CL11 | IMO/IHO Workshop on S-100 Implementation. |
| CL10 | Questionnaire for the IHO - Nippon Foundation Geospatial Marine Analysis and Cartography (GEOMAC) Project. |
| CL09 | 23rd meeting of the Capacity Building Sub-Committee (CBSC23) 28 - 30 May 2025, IHO Secretariat, Monaco and the 17th meeting of the Inter-Regional Coordination Committee (IRCC17) 03-05 June 2025, IHO Secretariat, Monaco. |
| CL08 | IHO Project Empowering Women in Hydrography. Shom (France) Hydrographic Training - Call for Applications. |
| CL07 |
S-100-Based Product Specifications Phase 1 – S-124 Navigational Warnings, S-128 Catalogue of Nautical Products CALL FOR APPROVAL and S-158:101 Edition 1.0.0 Electronic Navigational Chart Validation Checks - Publication Notice. |
| CL06 | Master of Science Programme in Hydrographic Science at the University of Southern Mississippi (USA) sponsored by the Republic of Korea, Selection of candidates (13th Course, 10 August 2025 - 5 August 2026). |
| CL05 | UN Ocean Decade Activity Register, UNOC3 Participation, UNOC3 Political Declaration. |
| CL04 | Call for Applications for Training under the IHO - Nippon Foundation Geospatial Marine Analysis and Cartography (GEOMAC) Project, UKHO, Taunton, UK |
| CL03 | Adoption of IHO Publications / S-100 Based Product Specifications Phase 1 – S-101, S-102, S-104, S-111, S-129. |
| CL02 | 17th meeting of the Hydrographic Services and Standards Committee (HSSC-17), 5-9 May 2025 Stavanger, Norway. |
| CL01 | Theme for World Hydrography Day 2025 and Media Outreach. |
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