Abstract: A system and structure determines when or if a utility cart is entering a restricted geographical area, and can disrupt the ignition of the cart to prevent or at least stop such use. The system can also determine a safe time and location for such ignition disruption. A monitoring device can remotely and reliably monitor the state of charge of the cart's battery, even for carts of a range of different battery energy capacities, rated voltage, and technical makeup, and communicate such information to a computer system. A standalone device can be retrofitted onto an existing golf cart without requiring fundamental changes to the cart's initial construction. The device can include an inexpensive module that can reliably monitor the battery state and implement ignition cutoff without requiring software processing capacity within the module.