|Launch mass||5,959 kilograms (13,137 lb)|
|Start of mission|
|Launch date||11 March 2005|
|Launch site||Cape Canaveral Space Launch Complex 41|
Inmarsat-4 F1 is a communications I-4 satellite operated by the British satellite operator Inmarsat. It was launched into a geosynchronous orbit at 21:42 GMT on 11 March 2005 from Space Launch Complex 41 at Cape Canaveral, Florida. By an Atlas 5 in the 431 configuration. It is currently located at 143.5 degrees East.
On 17 February 2018 Inmarsat-4 F1 experienced outage due to loss of attitude control.