All systems come with a build-in GPS receiver. With a system intended for vehicle use, we believe this must be a standard feature.
When the system is switched off, the system controller will activate the GPS receiver every 5 minutes. This way, the GPS receiver can maintain hot-start aquisition performance. In addition, the position updates can be used for logging or geofencing.
During power down state, the system controller can monitor the periodic updates and wake the system if the geofence is passed. This is not intended to replace a regular GPS based alarm system, but it can serve as a backup.