Threats to GPS

From GPS World:

Here's yet another way to measure the success of GPS: by the efforts to negate it. While unintentional jamming continues to rise, intentional jamming by both foreign military forces and at-home miscreants of various stripes also has shown increased vigor in the past six months. I'll relate here recent instances of intentional jamming on each side of the border, and briefly outline one initiative mounted by the National Geospatial Intelligence Agency (NGA) to counteract it.

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