Furuno GPS/GNSS receiver maintain high accuracy where other receivers fail by utilizing multipath mitigation and Dead Reckoning (DR). Typically, precise GPS/GNSS positioning can be achieved only by receiving signals from three to four GPS/GNSS satellites at the same time. When relying on GPS/GNSS only positioning, there may be instances where the position accuracy is degraded or lost. For example when the vehicle moves in areas where the GPS/GNSS signals cannot be received (tunnels or underground passages) or where very strong multipath propagation occurs (areas surrounded by tall glass covered buildings). To overcome such limitations of GPS/GNSS positioning, a Dead Reckoning solution is useful. This function allows the receiver to maintain highly accurate positioning by using information from various sensors (gyro sensor, accelerometer, speed pulse) to calculate the current position, even when GPS/GNSS only positioning is difficult or impossible. Dead Reckoning solution is widely utilized in automotive navigation systems.