Through the service offered from server GEOFIX, a customer can, in real time, continuously localize a vehicle equipped with our remote unit "Blackstar". In particular Blackstar can: - Send periodically its position on predefined fixed distance with configuration via SMS, - Send automaticly and periodically more positions compressed on a single message, until 30 positions for message. The configuration of the parameters for the memorization and the shipment of the compressed positions happens via SMS: interval of time, distance. Connecting "Blackstar" with external sensors it is possible control multiple optional information.