In-car GPS developers have long had to wrestle with the urban canyon effect that blocks or bounces signals downtown: they often have to make best guesses for accuracy when they can't count on cellular or WiFi triangulation to pick up the slack, like a smartphone would. The Universidad Carlos III de Madrid has nonetheless found a way to borrow a page from mobile devices to get that accuracy back. By supplementing the GPS data with accelerometers and gyroscopes, researchers can use direction changes and speed to fill in the blanks,
