An image control device, which achieves energy saving effects without degradation of an image to be displayed, even if image data includes a fault, is configured to decode received image data into an image, generate display information based on the received image data, and output a decoded image and display information. The invention involves a sequence of exchanges between an aiding source and a receiver that serve to provide aiding information to the receiver so that the receiver’s location may be determined in the presence of weak satellite transmissions. In an alternative embodiment the signal alert system may also send a signal to the enginebrake system of the automobile to perform automatic throttle control or braking when the driver fails to attempt a required stop at the traffic light.