Around here most the ranchers and construction owners use GPA tracking devices on their tractors, they leave them parked all over. As I understand it, it is hidden deep in the tractor, and is activated when the machine is turned off. if the tractor is moved more than X feet it sends out a signal. Every once in awhile, there something in the news about the cops catching someone driving one off or trailering one.
Don't know what they cost? But they work.
JD
Don't know what they cost? But they work.
JD