The vShepherd systems from Asset Tracking Services (ATS) combine the power of GPS locating technology with wireless communication and the Internet. The vShepherd FleetReach family of reporting modules now includes Preventive Maintenance, which provides color-coded warnings that prioritize units requiring attention, lists the last location of any unit and provides a map feature for coordinating the service of multiple units. Standard vShepherd modules provide on-demand location via the Internet and allow activating a theft-deterrent "vFence" via the Internet or from a telephone. Most stolen assets, says ATS, are recovered in less than an hour after the vFence alarm is reported to the Alarm Center.