What is inertial navigation to drive a car into a tunnel? No navigation.

Inertial navigation generally refers to intelligent navigation devices such as mobile phones. In the process of navigation, if the gps signal is lost, mobile navigation software will judge the driving condition of the car according to various sensors of the mobile phone, such as throttle and gyroscope, and use inertia to drive along the original road until the gps signal is searched. That is to say, after the gps signal is lost, the mobile navigation system judges or predicts the driving state of the car according to the state before the loss and the sensor, and displays it in the navigation software.