- This is the most accurate method with the OBU extracting the distance travelled from the vehicle’s CANbus. Read more about CANbus at http://en.wikipedia.org/wiki/CAN_bus
- During a journey, the telematics device calculates the distance between each GPS location and sums these distance values together to derive the total distance for the journey.
- This method is not as accurate as the distance obtained from the CANbus.
