International Mobile Satellite Organization (IMSO)

Organisation internationale de télécommunications mobiles par satellite
Organización Internacional de Telecomunicaciones Móviles por Satélite

Search Open Yearbook

This information is part of the Open Yearbook, a free service of UIA's subscription-based Yearbook of International Organizations (YBIO). It includes profiles of non-profit organizations working worldwide in all fields of activity. The information contained in the profiles and search functionality of this free service are limited.

The full-featured Yearbook of International Organizations (YBIO) includes over 72,500 organization profiles, additional information in the profiles, sophisticated search functionality and data export. For more information about YBIO, please click here or contact us.

The UIA is a leading provider of information about international non-profit organizations. The aim of the Open Yearbook is to promote the activities of international non-governmental organizations (INGOs) and intergovernmental organizations (IGOs).

Contact Details


More detailed data available with paid subscription.




Established pursuant to the signing, 3 Sep 1976, of a Convention and Operating Agreement. Establishment followed B-XB1117 - International Maritime Organization (IMO) decision in 1973 to establish a new maritime communications system based on satellite technology. Operating Agreement entered into force, 16 July 1979. Operations providing maritime services began 1 Feb 1982 from a base in London (UK). Amendments to Inmarsat Convention approved, Oct 1985, by Inmarsat Assembly of Parties - at which all member countries were entitled to be represented - to permit the offering of aeronautical satellite communication services; in Jan 1989, further amendments enabled provision of land-mobile satellite services. Amendments to Convention approved Sep 1998 to provide for restructuring of Inmarsat and retaining governmental oversight by the organization (IMSO) of public services obligations; entered into force on the basis of provisional application 15 Apr 1999; amendments entered formally into force 31 Jul 2001. Amendments to Convention approved Oct 2008 to provide for extending governmental oversight to other potential Global Maritime Distress and Safety System (GMDSS / SMDSM) providers and for IMSO's functions as coordinator of Long Range Identification and Tracking of Ships (LRIT); amendments entered into force on the basis of provisional application 6 Oct 2008, pending their formal entry into force.


Ensure the provision of maritime mobile satellite communications services for the GMDSS based on the international regulations, standards, recommendations, resolutions and procedures relating to the GMDSS as set out in the relevant Public Services Agreement (PSA) concluded between the Organization and the recognized service providers.


2024-12-09 | London, UK – Assembly

14 past events available with paid subscription only.


Available with paid subscription only.


Assembly of Parties (every 2 years); Advisory Committee; Directorate headed by the Director General. Headquarters located in London (UK).


Available with paid subscription only.


Available with paid subscription only.

Relations with Inter-Governmental Organizations

Available with paid subscription only.

Relations with Non-Governmental Organizations

Available with paid subscription only.


Available with paid subscription only.

Type I Classification

Available with paid subscription only.

Type II Classification

Available with paid subscription only.



Last News


* Subject classification is derived from the organization names and aims.
** UN SDGs are linked to the subject classification.

You are viewing profile from the Yearbook of International Organizations Online.
← return to your search page to find additional profiles.
Terms of Use

UIA allows users to access and make use of the information contained in its Databases for the user’s internal use and evaluation purposes only. A user may not re-package, compile, re-distribute or re-use any or all of the UIA Databases or the data* contained therein without prior permission from the UIA.

Data from database resources may not be extracted or downloaded in bulk using automated scripts or other external software tools not provided within the database resources themselves. If your research project or use of a database resource will involve the extraction of large amounts of text or data from a database resource, please contact us for a customized solution.

UIA reserves the right to block access for abusive use of the Database.

* Data shall mean any data and information available in the Database including but not limited to: raw data, numbers, images, names and contact information, logos, text, keywords, and links.