A server and a corresponding method for communicating over a network with a first mobile device that is registered on the network and configured to transmit, via the network, positional data of the first mobile device to the server. The server including circuitry that outputs an instruction to a first mobile device, computes a time delay incurred in commencing the instruction, authenticates identifying information from the first mobile device, monitors a location of the first mobile device, to determine a displacement of the location of the first mobile device with respect to the location of a second mobile device, updates a factor based on data received by the server from the first and second mobile devices. The server further determines, based on the factor being lower than a predetermined factor threshold, a second instruction to be sent to the first mobile device.