Acceleration Sensor
When the vehicle accelerates and slows down, the acceleration sensor outputs a voltage. Since the sensor is affected when the vehicle is slanted (such as driving or stopped on a hill), the audio-navigation unit calculates the slant angle of the vehicle based on the offset voltage.
Because of calculating the slanting of vehicle correctly, the audio-navigation unit sets up the offset in these cases:
- The GPS altitude is constant.
- The vehicle speed is constant.