The deliberate interference with the substation's electricity equipment was condemned by NIE safety manger Kevin McDowell.
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It is a deliberate interference in American politics that is well calculated to make a difference.
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Because they rely on signals from satellites transmitting from an altitude of around 20, 000 kilometres (12, 400 miles), the signals are very weak, making them vulnerable to accidental or deliberate interference.
ECONOMIST: GPS jamming
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