An electronic map combined with route instructions, usually displayed on a dashboard video screen. The system communicates with a satellite to display, on the screen, the vehicle’s geographic location and direction of travel. Most systems let you input a destination. A computer then calculates the best route and issues audible and visual directions to reach that destination. A few navigation systems lack a map, but provide vocal instructions. Some systems operate with voice recognition, and are able to “understand” addresses and other spoken instructions. Navigation systems are usually optional, though some luxury models have them as standard equipment.