He said the engine was running, there was food on the table, a laptop was turned on, and the radio and global positioning satellite (GPS) were working.

The car will be guided by a differential GPS system that corrects errors arising in global positioning satellite signals as they travel through the ionosphere and troposphere.

They are getting a lot more efficient; they have a lot better crop genetics and agronomic practices like no-till farming and things like GPS [satellite-dependent global positioning system].