An onboard device comprising a processor, a memory coupled to the processor, and an analog-to-digital (A/D) converter. The onboard device also comprises a transceiver and a global positioning system (GPS) receiver. In some embodiments, the memory of the onboard device stores a program that, when executed causes the processor to monitor voltage levels of a main battery of a vehicle for presence of a start sequence of a vehicle, detect movement of the vehicle, and send a message to an operations center indicating movement of the vehicle without occurrence of the start sequence.