Abstract: A control system for tracking moving objects and controlling an action at a selected one of a plurality of geographic locations is described.

Abstract: A personal security device for use in signaling an alarm event is described which is arranged to be worn on or about the human body in an accessible manner. The device comprises: user-operable activation means for activating a response to an alarm event, the activation means being activatable by a physical change of state caused by user interaction with the activation means and being arranged to indicate activation to the user in a subtle, non-obvious manner, a transmitter responsive to the activation means for transmitting an alarm event signal indicating the occurrence of an alarm event; and an inactive power source integrated into the device, the inactive power source being coupled to the transmitter. The activation means is arranged to interact with the inactive power source to activate the same and thereby electrically power the transmitter and initiate the sending of the alarm event signal.

Abstract: This disclosure provides for a method of securely transmitting communication information from a first terminal operating in a first coordinate measurement domain to a second remotely-located terminal operating in a second coordinate measurement domain. The method includes combining the communication information with extraneous information to create a data signal, determining a value of an identification variable expressed with respect to the first coordinate measurement domain, where the identification variable value enables the location of the communication information concealed within the data signal to be determined, using a coordinate transform function to calculate a value of the received identification variable expressed with respect to the second coordinate measurement domain, and extracting the information from the received data signal using the calculated identification variable value to distinguish the communication information from the extraneous information.