Over the last few days, heightened solar activity (and those heady geomagnetic storms) led to outages in the GPS navigation systems that guide some modern tractors from John Deere and other brands. 404 Media reported farmers have been told to pause using high-tech tractors that use GPS systems to program and tightly farm their land.

The storm interfered with navigational systems used in tractors and other farming equipment, leaving some farmers temporarily unable to plant their crops.

Geomagnetic storms can disrupt several kinds of navigation and communications equipment. That includes the autonomous navigation hardware of some tractors, the Times reported. The disruption left many U.S. farmers unable to plant corn with their John Deere vehicles.

The solar storms that have been wowing people with the Northern Lights across the United States the last two nights have also been disrupting GPS satellites, crippling some Midwest farmers’ operations,