Yes .. NASA thinks
intense radio emission from flares and these changes in the atmosphere can degrade the precision of Global Positioning System (GPS) measurements.
But that comment doesn't say HOW MUCH it degrades the position.
News media love to get hysterical about this sort of thing.
The sky MIGHT fall, asteroids MIGHT hit earth.
Human sacrifice, dogs and cats living together... mass hysteria!
Rather than non-specific hysteria, here's some real information on potential impact.
http://www.phantompilots.com/threads/solar-flares.35796/#post-331319