Circular Letters 2025
| Reference | Title |
| 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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