Abstract: Methods and apparatuses are provided, for use singlely, or as part of a comprehensive security solution, for ensuring the integrity of a supply chain involving transportation, storage and/or sale of fluids such as petrochemicals. Passage of a fluid through an opening in an otherwise closed fluid tank is controlled by locking the opening against passage of fluid therethrough until a signal derived from a GPS is received, indicating that the tank is positioned at a pre-determined location whereat the opening in the tank is to be unlocked for allowing passage therethrough of the fluid. The tank may be, inter alia, a mobile tank, a stationary tank at a bulk station, or a stationary tank at a service station.

Abstract: A primary device for a synchronous event system. In one construction, the primary device includes a solar panel operable to convert light into electricity; a receiver operable to receive a global positioning system time signal; a processor coupled to the receiver and operable to process the global positioning system time signal to produce a processed time component; a internal clock coupled to the processor and operable to store the processed time component and to increment relative to the processed time component thereafter to produce an internal time; and a transmitter coupled to the processor and operable to transmit the internal time to a secondary device for wireless reception by the secondary device and synchronization of the secondary device relative to the primary device.