Abstract: A system for monitoring the status of mobile units includes a module and a local station. The module attaches to the mobile unit and includes a sensor and transmitter. The module transmits signals to a receiver at the local station. The signals can indicate shock, tampering, or theft. The receiver delivers the signal to a computer at the local station. The computer stores and analyzes the data. The computer includes a display, a keyboard, and a printer. The computer is programmed to present the data to the user and is fitted with an internal card to dial a monitoring station.