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A more subtle impact might be small changes in the GPS orbits due to changes in drag on the satellite by increased local particle density should the shock from the CME push the magnetosphere in far enough to put the GPS satellites outside the magnetosphere and into the solar wind. These changes will result in short-term GPS errors, as the satellites won't be where they are expected to be. This, however, can be fixed fairly quickly by correcting the orbits and the orbit elements from which the expected positions are calculated.