The position of the vehicle is not the same as the actual position, what should I do?

There is a limit to the accuracy of location information on smartphones and tablets. The accuracy can be greatly improved by using an external GNSS/GPS device.For more information about the accuracy of the equipment and the standard work, please refer to  "Using external GNSS/GPS equipment" in the AgriBus-NAVI User's Manual - Installation (public version)here.