Abstract: A portable device, for example an offender monitor, can utilize a location detector, such as a GPS receiver, to provide locational information for the device. The portable device can communicate over a cellular network, for example transmitting location readings over the network. The device can maintain the location detector in a state of reduced energy consumption and activate the receiver when conditions of the cellular environment indicate a high probability of the device moving a noteworthy distance. In various examples, the decision can take into consideration change in signal strength and/or history of cell tower utilization.

Abstract: A portable device, for example an offender monitor, can utilize a location detector, such as a GPS receiver, to provide locational information for the device. The portable device can communicate over a cellular network, for example transmitting location readings over the network. The device can maintain the location detector in a state of reduced energy consumption and activate the receiver when conditions of the cellular environment indicate a high probability of the device moving a noteworthy distance. In various examples, the decision can take into consideration change in signal strength and/or history of cell tower utilization.

Abstract: A device for evaluating access to a computer network from a specified location is disclosed comprising an interface for connecting to the computer network at the specified location and a processor coupled to the interface, the processor capable of using the interface to access at least one network component coupled to the computer network. The result of the device attempting to access the at least one network component is used in evaluating access to the computer network from the specified location.