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@Bobbo
^^ESA will soon be launching their own equivalent, although they have been saying that for years, my mates dad is working on it with ESTEC, in the meantime Arianne could still launch a GPS satellite (I think). Besides geostationary satellites have a very predictable orbit that doesn't degrade rapidly and the satellites are little more than atomic clocks and radio transmitters, also being military technology there will be multiple redundancies built in.