But our growing reliance on the system masks the fact that it can still be manipulated by those in control of its signals, including the United States government, which retains the ability to selectively deny positioning signals to any region it chooses.26 In the summer of 2017, a series of reports from the Black Sea showed deliberate interference with GPS occurring across a wide area, with ships’ navigation systems showing them tens of kilometres off their actual position. Many were relocated onshore, finding themselves virtually marooned in a Russian airbase – the suspected source of the
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