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http://www.satil.com/launchpad/inmarsat4f3.htm

Mobile broadband coverage of the world moves a step closer on August 14 with the launch of the third and final Inmarsat-4 (I-4) satellite.

Watch the launch - live - on this website as the Proton M rocket lifts Inmarsat-4 F3 - among the world's most advanced commercial mobile communications satellites - into orbit.

Lift off is scheduled at 22:46 UTC (23:46 BST) on August 13 from the Baikonur Cosmodrome in Kazakhstan, about 2,100 km (1,300 miles) south-east of Moscow.

Geostationary orbit
The Proton M, which is marketed by International Launch Services (ILS), will carry the Inmarsat-4 F3 into geostationary transfer orbit at 35,786km (22,240 miles).

Once tested and operational, the I-4 F3 will be provide satellite phone and mobile broadband services to North and South America at 98 degrees west.

And together with its two sister satellites, already in orbit, the completed constellation will deliver full and seamless global coverage for our entire range of broadband mobile satellite services.