A Mars man was charged stalking and other offenses after Adams Township police said they used the GPS tracking device he allegedly put on his ex-girlfriend’s car to lure him to them.

Jeffrey J. Arnold, 58, was charged with stalking, loitering and prowling at night and disorderly conduct following the July 27 incident.

Police said they responded to a suspicious person report in the 300 block of Mars Valencia Road, and were told someone was seen going underneath a woman’s vehicle.

Officers said they found a GPS tracking device held by a magnet in the passenger side wheel well of the vehicle. The woman told officers she and her boyfriend recently broke up.

The officers placed the GPS unit in their patrol vehicle and drove to a parking lot along Route 228. Around 4:24 a.m., an officer walked to the rear of the patrol vehicle and saw a man, later identified as Arnold, laying in grass at the base of a tree.

After Arnold told the officer his girlfriend was in the area, the officer told him he had the tracker in the patrol vehicle and Arnold was placed under arrest, police said.

Arnold told police he parked his vehicle nearby and walked to the location and admitted to stalking the woman, police said. His preliminary hearing is scheduled for Aug. 28 before District Judge Amy Marcinkiewicz.