Inmarsat Global Ltd.
Company typeSubsidiary
IndustrySatellite communication
Founded1979; 45 years ago (1979)
HeadquartersLondon, England
RevenueUS$1,465.2 million (2018)[1]
US$288.7 million (2018)[1]
US$125.0 million (2018)[1]
Number of employees
1,500 (2019)[2]
ParentViasat Edit this at Wikidata
Inmarsat-3 satellite
Inmarsat satellite telephone in use after a natural disaster in Nias, Indonesia. The unit depicted was manufactured by Thrane & Thrane A/S of Denmark. (April 2005)

Inmarsat is a British satellite telecommunications company, offering global mobile services. It provides telephone and data services to users worldwide, via portable or mobile terminals which communicate with ground stations through fifteen geostationary telecommunications satellites.[3]

Inmarsat's network provides communications services to a range of governments, aid agencies, media outlets and businesses (especially in the shipping, airline and mining industries) with a need to communicate in remote regions or where there is no reliable terrestrial network. The company was listed on the London Stock Exchange until it was acquired by Connect Bidco, a consortium consisting of Apax Partners, Warburg Pincus, the CPP Investment Board and the Ontario Teachers' Pension Plan, in December 2019.

On 8 November 2021, a deal was announced between Inmarsat's owners and Viasat, in which Viasat was to purchase Inmarsat. The acquisition was completed in May 2023.[4]



Further information: International Mobile Satellite Organization

The present company originates from the International Maritime Satellite Organization (INMARSAT), a non-profit intergovernmental organisation established in 1979 at the behest of the International Maritime Organization (IMO)—the United Nations maritime body—and pursuant to the Convention on the International Maritime Satellite Organization, signed by 28 countries in 1976.[5][6] The organisation was created to establish and operate a satellite communications network for the maritime community.[5][7] In coordination with the International Civil Aviation Organization in the 1980s, the convention governing INMARSAT was amended to include improvements to aeronautical communications, notably for public safety.[5] The member states owned varying shares of the operational business.[6] The main offices were originally located in the Euston Tower, Euston Road, London.[8]


In the mid-1990s, many member states were unwilling to invest in improvements to INMARSAT's network, especially owing to the competitive nature of the satellite communications industry, while many recognised the need to maintain the organisation's older systems and the need for an intergovernmental organisation to oversee public safety aspects of satellite communication networks.[6] In 1998, an agreement was reached to modify INMARSAT's mission as an intergovernmental organisation and separate and privatise the organisation's operational business, with public safety obligations attached to the sale.[6]

In April 1999, INMARSAT was succeeded by the International Mobile Satellite Organization (IMSO) as an intergovernmental regulatory body for satellite communications, while INMARSAT's operational unit was separated and became the UK-based company Inmarsat Ltd.[5][9] The IMSO and Inmarsat Ltd. signed an agreement imposing public safety obligations on the new company.[5] Inmarsat was the first international satellite organisation that was privatised.[6]

In 2005, Apax Partners and Permira bought shares in the company. The company was also first listed on the London Stock Exchange in that year.[10] In March 2008, it was disclosed that U.S. hedge fund Harbinger Capital owned 28% of the company.[11] In 2009, Inmarsat completed the acquisition of satellite communications provider Stratos Global Corporation (Stratos)[12] and acquired a 19-per cent stake in SkyWave Mobile Communications Inc., a provider of Inmarsat D+/IsatM2M network services which in turn purchased the GlobalWave business from TransCore.[13] Inmarsat won the 2010 MacRobert Award for its Broadband Global Area Network (BGAN) service.[14][15]

Inmarsat at first provided services using Marisat[16] and MARECS,[17] which were launched by the US Navy and ESA respectively. In the early 1990s Inmarsat launched its first dedicated satellite constellation, Inmarsat-2. These satellites provided the Inmarsat-A service for maritime uses.[18] Between 1996 and 1998 Inmarsat's second constellation, Inmarsat-3, was launched. Consisting of five geostationary L-band satellites the constellation provides the Inmarsat-B and Inmarsat-C services, primarily providing low bandwidth communications and safety services for global shipping.[19] Following privatisation in 1999 Inmarsat developed and launched the first satellite communications system offering global coverage, BGAN.[20] This service was provided initially through the three Inmarsat-4 satellite launched between 2005 and 2008, and was then extended with the addition of Alphasat in 2013.[21] In the 2010s, Inmarsat began development of the High Throughput Satellite (HTS) constellation Global Xpress, operating in the Ka-band portion of the spectrum. Global Xpress, launched in 2015, offers global satellite capacity to various markets including shipping and aviation. Global Xpress also marks a significant expansion of Inmarsat's commercial operations in the aviation markets.[22][23] In 2017, Inmarsat launched its first S-band satellite, intended to provide (in association with an LTE ground network) inflight internet access across Europe.[24] In March 2018, Inmarsat partnered with Isotropic Systems to develop a state-of-the-art, all electronic scanning antenna intended to be used with the Global Xpress network.[25]

On 20 September 2018, Inmarsat announced its strategic collaboration with Panasonic Avionics Corporation for an initial ten-year period, to provide in-flight broadband for commercial airlines. Inmarsat will be the exclusive provider of Panasonic for connectivity using the Ka-band satellite signal.[26] Inmarsat will now be offering Panasonic's portfolio of services to its commercial aviation customers.[27]

Malaysia Airlines Flight 370

Further information: Analysis of Malaysia Airlines Flight 370 satellite communications

In March 2014, Malaysia Airlines Flight 370 disappeared with 239 passengers and crew en route from Kuala Lumpur to Beijing. After turning away from its planned path and disappearing from radar coverage, the aircraft's satellite data unit remained in contact with Inmarsat's ground station in Perth via the IOR satellite (Indian Ocean Region, 64° East). The aircraft used Inmarsat's Classic Aero satellite phone service. Analysis of these communications by Inmarsat and independently by other agencies determined that the aircraft flew into the southern Indian Ocean and was used to guide the search for the aircraft.[28][29]

Takeover by Connect Bidco and privatisation

In March 2019 the company's board agreed to recommend a takeover offer of US$3.4 billion from Connect Bidco, a consortium consisting of Apax Partners, Warburg Pincus, the CPP Investment Board and the Ontario Teachers' Pension Plan.[30] On 9 October 2019, Bloomberg reported that the UK government was set to approve the takeover with the final consultation for the deal set to conclude on 24 October 2019.[31] In November 2019, Inmarsat rejected an eleventh-hour effort to derail the US$6 billion sale, in which it was accused of ignoring a potential boost to the company's value. Oaktree argued that the recommended offer for Inmarsat failed to take account of the potential value of spectrum assets used by Inmarsat's U.S. partner Ligado.[32] Inmarsat delisted from London Stock Exchange, as the private equity funds took control of the company, on 5 December 2019; at the time, Inmarsat was operating 14 geostationary communications satellites.[33][34]

Acquisition by Viasat

On 8 November 2021, a $7.3bn deal was announced between Inmarsat's owners, led by Apax and Warburg Pincus, and Viasat in which Viasat would purchase Inmarsat for $850m in cash, issuing approximately 46 million shares of Viasat stock and taking on $3.4bn in debt.[35] Viasat has promised to honour a pledge made by the previous owners, when it was taken private in 2019, that Inmarsat would remain a UK-based company, and for other planned investments.[36]

Provisional approval for the merger was given by the UK's Competition and Markets Authority in March 2023[37] with 25 May 2023 set as the date for a formal decision.[38] On 31 May 2023, the acquisition was closed.[39][40]


The Inmarsat head office is at Old Street Roundabout in the London Borough of Islington.[41] Aside from its commercial services, Inmarsat provides Global Maritime Distress and Safety System (GMDSS) to ships and aircraft at no charge, as a public service.[42]

Services include traditional voice calls, low-level data tracking systems, and high-speed Internet and other data services as well as distress and safety services. The Broadband Global Area Network (BGAN) network provides General Packet Radio Service (GPRS) - type services at up to 800 kbit/s at a latency of 900-1100 ms[43] via an Internet Protocol (IP) satellite modem the size of a notebook computer,[44] while the Global Xpress network offers up to 50 Mbit/s at a latency of 700 ms[45] via antennas as small as 60 cm.[46] Other services provide mobile Integrated Services Digital Network (ISDN) services used by the media for live reporting on world events via videophone,[47] and inflight Internet access via the European Aviation Network.[24]

The price of a call via Inmarsat has now dropped to a level where they are comparable to, and in many cases lower than, international roaming costs, or hotel phone calls. Voice call charges are the same for any location in the world where the service is used. Tariffs for calls to Inmarsat country codes vary, depending on the country in which they are placed. Inmarsat primarily uses country code 870 (see below).[48] Newer Inmarsat services use an IP technology that features an always-on capability where the users are only charged for the amount of data they send and receive, rather than the length of time they are connected.[49] In addition to its own satellites, Inmarsat has a collaboration agreement with ACeS regarding handheld voice services.[50]


Inmarsat Global HQ at 99 City Road, London. (January 2006)

There are three types of coverage related to each Inmarsat I-4 satellite.[51]

Global beam coverage

Each satellite is equipped with a single global beam that covers up to one-third of the Earth's surface, apart from the poles. Overall, global beam coverage extends from latitudes of −82 to +82° regardless of longitude.

Regional spot beam coverage

Each regional beam covers a fraction of the area covered by a global beam, but collectively all of the regional beams offer virtually the same coverage as the global beams. Use of regional beams allow user terminals (also called mobile earth stations) to operate with significantly smaller antennas. Regional beams were introduced with the I-3 satellites. Each I-3 satellite provides four to six spot beams; each I-4 satellite provides 19 regional beams.

Narrow spot beam coverage

Narrow beams are offered by the three Inmarsat-4 satellites. Narrow beams vary in size, tend to be several hundred kilometres across. The narrow beams, while much smaller than the global or regional beams, are far more numerous and hence offer the same global coverage. Narrow spot beams allow yet smaller antennas and much higher data rates. They form the backbone of Inmarsat's handheld (GSPS) and broadband services (BGAN). This coverage was introduced with the I-4 satellites. Each I-4 satellite provides around 200 narrow spot beams.

Global Xpress (I-5)

The Inmarsat I-5 satellites provide global coverage using four geostationary satellites.[52] Each satellite supports 89 beams, giving a total coverage of approximately one-third of the Earth's surface per satellite. In addition, 6 steerable beams are available per satellite, which may be moved to provide higher capacity to selected locations.[53]

On 26 November 2019, the first satellite to extend the original 4 satellite first generation Global Xpress constellation was launched from Centre Spatial Guyanais (CSG) by an Ariane 5 launch vehicle.[54]


GX5 satellite
Satellite Coverage Longitude Vehicles Launch date (UTC) Services / notes
Marisat series
Marisat F1 Delta 2914 19 February 1976 Decommissioned 1997
Marisat F2 Delta 2914 14 October 1976 Transferred to Intelsat in 2004, decommissioned in 2008
Marisat F3 Delta 2914 10 June 1976 Decommissioned
MARECS series
MARECS-A Ariane 1 20 December 1981 Deactivated August 1996
MARECS-B Ariane 1 9 September 1982 Launch failure
MARECS-C Ariane 3 10 November 1984 also known as MARECS-B2, deactivated 2002
Inmarsat-2 series
Inmarsat-2 F1 Delta II 6925 30 October 1990 Decommissioned 19 April 2013
Previous record holder for mission lifespan[55]
Inmarsat-2 F2 Delta II 6925 8 March 1991 Decommissioned in December 2014
World record for mission lifespan[55]
Inmarsat-2 F3 Ariane 44L 16 December 1991 Decommissioned 2006
Inmarsat-2 F4 Ariane 44L 15 April 1992 Decommissioned 2012
Inmarsat-3 series
Inmarsat-3 F1 Atlas IIA 3 April 1996 Reassigned to Maritime safety backup service in 2020
Inmarsat-3 F2 Proton-K/DM1 6 September 1996 Reassigned to Maritime safety backup service in 2019
Inmarsat-3 F3 178° East Atlas IIA 18 December 1996 Existing and evolved services only
Inmarsat-3 F4 Ariane 44L 3 June 1997 Decommissioned 2016
Inmarsat-3 F5 AOR 54° West Ariane 44LP 4 February 1998 L-band, Classic Aero services and other various leases
Inmarsat-4 series
Inmarsat-4 F1[56] APAC 143.5° East Atlas V 431 11 March 2005 L-band, BGAN family, Classic Aero, SPS and lease services
Inmarsat-4 F2[57] IOR 64° East Zenit-3SL 8 November 2005 L-band, BGAN family, Classic Aero, SPS and lease services, FleetBroadband, SwiftBroadband

Transferred from 25° East to 63° East in mid-2015[58]

Inmarsat-4 F3[59] AMER 98° West Proton-M / Briz-M 18 August 2008 L-band, BGAN family, Classic Aero and lease services
Inmarsat-4A F4 (AlphaSat)[60] EMEA 25° East Ariane 5ECA 25 July 2013 L-band, BGAN family, Classic Aero, SPS and lease services
Inmarsat-5 (GX) series[61][62]
Inmarsat-5 F1 (GX-1)[63][64] I-5 Europe, Middle East, Africa 62.6° East Proton-M / Briz-M 8 December 2013 Ka-band global data services, Global Xpress
Inmarsat-5 F2 (GX-2)[65] I-5 Americas 55° West Proton-M / Briz-M 2 February 2015 Ka-band global data services, Global Xpress
Inmarsat-5 F3 (GX-3)[66] I-5 Pacific, Asia, West Americas 179.6° East Proton-M / Briz-M 28 August 2015 Ka-band global data services, Global Xpress
Inmarsat-5 F4 (GX-4)[67] I-5 Europe + in-orbit spare 56.5° East Falcon 9 Full Thrust 15 May 2017[68] Ka-band global data services, Global Xpress
Inmarsat-5 F5 (GX-5) Europe and Middle East 11° East Ariane 5ECA 26 November 2019[54] Ka-band global data services, higher capacity GX satellite after the 4 first generation satellites
European Aviation Network
Inmarsat S EAN (Hellas Sat 3)[69] Europe 39° East Ariane 5 28 June 2017 S-band services for European aviation
Inmarsat-6 series
Inmarsat-6 F1[70] H-IIA F45 22 December 2021
Inmarsat-6 F2[71] Falcon 9 Block 5 18 February 2023 Failed in orbit

Country codes

The permanent telephone country code for calling Inmarsat destinations is:[48]

The 870 number is an automatic locator; it is not necessary to know to which satellite the destination Inmarsat terminal is logged-in. SNAC is now usable by all Inmarsat services.

Country codes phased out on 31 December 2008 were

Since 18 July 2017, Inmarsat users using the service provided by China Transport Telecommunication & Information Center may apply for 11 digits Chinese mobile phone numbers starting with 1749. An international call function is not required when making phone calls to such numbers from Mainland China.[72]


Inmarsat-3 satellite locations

Inmarsat networks provide existing, evolved, and advanced services. Existing and evolved services are offered through land Earth stations which are not owned nor operated by Inmarsat, but through companies which have a commercial agreement with Inmarsat. Advanced services are provided via distribution partners but the satellite gateways are owned and operated by Inmarsat directly.

High Throughput Services

Advanced services

The "BGAN Family" is a set of IP-based shared-carrier services:[80]

M2M communications

The "BGAN M2M Family" is a set of IP-based services designed for long-term machine-to-machine management of fixed assets:[81]

Global voice services

The company offers portable and fixed phone services:[82]

Existing and evolved services

These are based on older technologies:[84]

Retired services

Projects since 2008

European Aviation Network

On 30 June 2008, the European Parliament and the European Council adopted the European's Decision to establish a single selection and authorisation process (ESAP – European S-band Application Process) to ensure a coordinated introduction of mobile satellite services (MSS) in Europe. The late 2008 selection process attracted four applications by prospective operators (ICO Global Communications (ICO), Inmarsat, Solaris Mobile (EchoStar Mobile), and TerreStar).[86][87]

In May 2009, the European Commission selected two operators, Inmarsat Ventures and Solaris Mobile, giving these operators "the right to use the specific radio frequencies identified in the Commission's decision and the right to operate their respective mobile satellite systems". EU Member States now have to ensure that the two operators have the right to use the specific radio frequencies identified in the commission's decision and the right to operate their respective mobile satellite systems for 18 years from the selection decision. The operators are compelled to start operations within 24 months (May 2011) from the selection decision.[88][89][90][91]

Inmarsat's S-band satellite programme provides mobile multimedia broadcast, mobile two-way broadband telecommunications and next-generation MSS services across all member states of the European Union and as far east as Moscow and Ankara by means of a hybrid satellite/terrestrial network. It was built by Thales Alenia Space and launched in 2017.[92] The complementary ground network consists of around 300 LTE base stations constructed by Deutsche Telekom.[93]

The European Aviation Network faced legal challenges as of 2018, including one from Viasat alleging unfair bidding practices and a misuse of spectrum[94] and a ruling by the Belgian telecommunications regulator revoking permission for the use of the ground network in Belgium.[95]

Global Xpress Expansion

Inmarsat ordered a fifth Global Xpress satellite from Thales Group. The satellite launched 26 November 2019 from Centre Spatial Guyanais (CSG) aboard an Ariane 5 launch vehicle.[54] The satellite has been described as a 'very high throughput satellite', and provides services to the Middle East, India and Europe.[96] former CEO Rupert Pearce (new CEO Rajeev Suri) indicated that Inmarsat planned further expansion of the Global Xpress network. Trials of new technologies demonstrated bandwidths of 330 Mbit/s over the existing Global Xpress network, far in excess of the existing 50 Mbit/s.[97]

Polar Coverage

To provide GX coverage to the users in the Arctic region, Inmarsat plans to improve GlobalXpress connectivity to above 65° North.[61]

Two high-capacity, multi-beam payloads GX-10A and GX-10B were planned in Highly elliptical orbits (HEO) for reliable coverage. Inmarsat worked in partnership with Space Norway HEOSAT in the Arctic Satellite Broadband Mission. The satellites carrying the Inmarsat payload were to be manufactured by Northrop Grumman Innovation Systems (NGIS). Launch for GX-10A and 10B was scheduled for 2022.[98]


At the end of 2015, Inmarsat ordered two sixth generation satellites from Airbus. These satellites planned to offer both Ka- and L-band payloads and additional capacity to the existing BGAN and Global Xpress networks.[99] In 2017, it was announced that the first of these satellites would be launched by MHI in December 2021.[100] The first of the two satellites, Inmarsat-6 F1, was successfully launched on 22 December 2021 on a H-IIA rocket.[101] The second satellite was launched on 18 February 2023 on a Falcon 9 Block 5 rocket, but suffered a power system failure in orbit that prevented it from becoming operational.[102]


In May 2023, Inmarsat ordered three eighth-generation satellites from Swissto12, which will be based on their HummingSat satellite platform.[103]


Inmarsat is participating in two ESA ARTES programs, IRIS and ICE:


INMARSAT and Iridium frequency bands abut each other at 1626.5 MHz thus each satcom radio has the ability to interfere with the other. Usually, the far more powerful INMARSAT radio disrupts the Iridium radio up to 10–800 m (33–2,625 ft) away.[107]

See also


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