John Deere dealership says a solar storm left GPS tracking on farmers' tractors 'extremely compromised'

• A severe geomagnetic storm hit the northern US.
• The storm caused auroras — and apparently disrupted precision farming systems, a John Deere dealership said.
• Satellite signals were "extremely impacted" by the storm, the dealership said.

One of the strongest solar storms in decades hit Earth this past weekend, sending stunning auroras far from the poles.

But for some farmers, the geomagnetic storm was more of a headache.