What is GPS jamming and why it is a problem for aviation?

(Fixes headline) By Anne Kauranen, Joanna Plucinska and James Pearson HELSINKI/LONDON (Reuters) -Estonia has accused neighbouring Russia of jamming GPS navigation devices in airspace above the Baltic states, echoing concerns from airlines that say they have been contending with such interference for months. Estonian Foreign Minister Margus Tsahkna’s accusation, for which he provided no proof,…

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