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IHO and NOAA Reaffirm their Commitment to Ocean Data with a New MoU
During the 2023 International Hydrographic Organization (IHO) Assembly, Secretary General Dr. Mathias Jonas announced the signing of a Memorandum of Understanding with the United States’ National Oceanic and Atmospheric Administration (NOAA). NOAA has supported the IHO since 1990 by hosting the IHO Data Center for Digital Bathymetry (DCDB), an online, open-access database that stores ocean depth data from around the world.

How to Participate in World Hydrography Day
Celebrated on 21 June, World Hydrography Day is designed to raise awareness about hydrography and how it plays a role in improved knowledge of the seas and oceans.

Legacy website and other services unavailable
Following a fire at one of the IHO web hosting service providers, the IHO legacy website, the S-100 website, and some documents on the IHO website are currently unavailable.

Navigation Warnings on the Web
The following map shows the limits of the 21 Operational NAVAREAs. NAVAREA Implementation Status and links to NAVAREA Coordinators’ website https://iho.int/en/iridium-safetycast-implementation-status (Note not all NAVAREA Coordinators publish warnings on the World Wide Web, some only provide Notice to Mariners.) Click here for a full list of contact details for all NAVAREA Coordinators NB The availability of Navigational Warnings on the web does not relieve Masters / Captains of the requirement to receive Navigational Warnings via IMO/IHO approved broadcast systems, as websites are not continuously updated and not necessarily monitored for correctness.
Empowering Women in Hydrography
While the number of women in the workforce has risen in recent decades, there remains an imbalance between men and women in leadership positions, and women are still underrepresented in many STEM subjects. To try and change this, the IHO launched the project “Empowering Women in Hydrography” in 2021, with the goal of raising awareness about career opportunities in hydrography, and to increase the number of women in leadership positions. The most recent study, conducted in early 2025, revealed that since the project's implementation, the percentage of female national hydrographers has increased from 7% to 13%—almost doubling. Similarly, the proportion of women chairing IHO bodies has risen from 13% to 24%. Additionally, women now vice-chair 32% of IHO organs. In 2022 the project was officially endorsed as a UN Ocean Decade Action.
Circular Letters
The IHO Secretariat communicates important information to Member States (MS) via Circular Letter (CL). Some CLs invite Member States to provide feedback to the Secretariat (e.g. approval of new editions of IHO Standards). In cases where MSs are invited to provide feedback via online form, the link to the form will be included in the CL. Further information is provided in CL 20/2019). All previous years CLs are available from the IHO searchable HERE. ________________ Spanish Circular Letters are available HERE
MEETINGS AND CONFERENCES AFTER 2024
List of ABLOS Meetings and Conferences Note: To access the meeting page, you'll need an IHO Portal account. If you don't have one yet, don't worry! Creating an account is easy. Simply follow the instruction provided at the link here to set up your account and gain access to the meeting page. Click the IHO Portal to get started ABLOS Meetings and Conferences Year Title Venue Date Remarks 2025 32nd ABLOS Business Meeting Doha, Qatar 6 and 9 October 2025 IHO Portal 2025 12th IHO-IAG Advisory Board on the Law of the Sea (ABLOS) Conference PROGRAMME (For more information and to register, please consult the ABLOS Website) Doha, Qatar 7 and 8 October 2025 ABLOS Website
The IHO visits the Commonwealth of the Bahamas
On invitation of the Bahamian Ministry of Foreign Affairs, IHO Director Luigi Sinapi paid a High Level Visit to the Commonwealth of The Bahamas from 15 to 19 April. The Visit was aimed at resuming discussions on the Bahamas’ potential membership to the International Hydrographic Organization and on the progress made in the maritime sector of The Bahamas, to further strengthening the national capacity in the area of hydrography and improving the current Bahamian Maritime National Policy.

Vital services continue around the world
Despite the covid-19 pandemic and many people across the world having to work from home, Hydrographic Offices around the globe can be proud of the work they are doing to continue to ensure safety at sea and other vital maritime services. Hydrographic Offices have had to adapt to new circumstances and are successfully ensuring that critical operations move forwards. Maritime Safety Information continues to be shared, NAVAREAs covered, and even the production and maintenance of digital nautical charts (ENCs) and relevant online marine data services is continuing despite constraints linked with the pandemic.
