Circular Letters 2021
| Reference | Title |
| CL49 | Cumulative list of IHO Circular Letters issued in 2021 |
| CL48 |
Availability of Work programme for 2022 and Roadmap v2.0 for the S-100 Implementation Decade |
| CL47 |
Joint Canada-IHO Project Empowering Women in Hydrography. Internships at the IHO Secretariat- Call for nominations. |
| CL46 | Guidelines for the conduct of meetings in hybrid format |
| CL45 | New IHO Member State - Republic of Iraq |
| CL44 | Former IHO Director Captain James 'Jim' Ayres |
| CL43 |
World Hydrography Day - Report on Member States' activities in 2021 and the proposed theme for 2022 |
| CL42Rev1 | Outcome of the Survey on the Production of High Density ENCs (HD ENCs) |
| CL41 |
IHO-Singapore Innovation and Technology Laboratory Launch and Webinar Series on Integrated Marine Geospatial Information Management 26 - 29 October 2021 |
| CL40 | Possible ECDIS display anomalies after ENC update procedure |
| CL39 | Training For Trainers (TFT) Programme in Basic Hydrography Sponsored by the Republic of Korea - Successful Nomination of candidates for the TfT course (1-12 November 2021) |
| CL38 |
Composition of the Maritime Autonomous Surface Ships (MASS) Navigation Project Team (MASS PT) |
| CL37 |
Adoption of the IHO Resolution 1/2021 - Principles of the WEND for S-1XX Products (WEND-100 Principles) |
| CL36 | Reinstatement of the Democratic Republic of Congo |
| CL35 | Joint CANADA-IHO Project Empowering Women in Hydrography |
| CL34 | IRCC Workshop on the Strategic Plan - 7 October 2021 VTC event |
| CL33 | Composition of the HSSC S-130 Project Team |
| CL32 | Training for Trainers Programme in Basic Hydrography, sponsored by the Republic of Korea (1-12 November 2021) - Call for Applications |
| CL31 | IHO - Nippon Foundation GEOMAC (Geospatial Marine Analysis and Cartography) Project |
| CL30 | Master of Science in Hydrographic Science at the University of Southern Mississippi (USA) sponsored by the Republic of Korea. Call for nominations. (10th Course August 2022 -August 2023) |
| CL29 | IHO-IOC GEBCO Guiding Committee (GGC) New IHO Representative |
| CL28 | Outcome of the 13th meeting of the Inter-Regional Coordination Committee |
| CL27 | Survey on S-100 Operational analysis |
| CL26 | Survey on the Production of High Density ENCs (HD ENCs) |
| CL25 | Call for approval of the IHO Resolution - Principles of the WEND for S-1XX Products (WEND-100 Principles) |
| CL24 | New IHO Member State - Republic of Kenya |
| CL23 | Establishment of the Maritime Autonomous Surface Ships (MASS) Navigation Project Team (MASS PT) |
| CL22 | New International Hydrographic Review website |
| CL21 | Peak-of-the-peak event for the celebrations of the IHO Centenary |
| CL20 | Joint CANADA-IHO Project Empowering Women in Hydrography |
| CL19 | Establishment of the S-130 Project Team |
| CL18 | Availability of the Work Programme 2021 |
| CL17 |
GEBCO Guiding Committee (GGC) Membership - request for nomination of an expert to fill vacancy |
| CL16 | Celebrations of the IHO Centenary on World Hydrography Day 21 June 2021 |
| CL15 | Master of Science Programme in Hydrographic Science at the University of Southern Mississippi (USA) sponsored by the Republic of Korea - 9th Course (6 August 2021 - 5 August 2022) - Selection of Candidates |
| CL14 | 19th Meeting of the Capacity Building Sub-Committee (CBSC19) 9 - 10 June 2021, Video teleconference (VTC) Event and 13th Meeting of the Inter-Regional Coordination Committee (IRCC13) 23 - 25 June 2021, Video teleconference (VTC) Event |
| CL13 |
Announcement of the selection of new Assistant Director at the IHO Secretariat |
| CL12 | Announcement of availability of the KHOA S-100 Viewer |
| CL11 |
Adoption of Edition 4.9.0 of IHO Publication S-4 - Chart Specifications of the IHO |
| CL10 |
IHO-IOC-Nippon Foundation / GEBCO Training Project |
| CL09 | Composition of the IHO Hydrographic Surveys Working Group |
| CL08 |
IHO - Nippon Foundation GEOMAC (Geospatial Marine Analysis and Cartography) Project |
| CL07 |
Announcement of UKHO Virtual Training Events |
| CL06 |
13th Meeting of the Hydrographic Services and Standards Committee (HSSC-13) 3 – 7 May 2021, Video teleconference (VTC) Event |
| CL05 | National Experts on the Law of the Sea |
| CL04 |
IHO-IAG Advisory Board on the Law of the Sea (ABLOS) - IHO Representatives |
| CL03 | New IHO Member State - Lebanese Republic |
| CL02 |
Call for approval of edition 4.9.0 of IHO Publication S-4 - Chart Specifications of the IHO |
| CL01 |
Theme for World Hydrography Day 2021 and media outreach |
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