<p>Methods and apparatus are disclosed for on-board memories for use in vehicle auto-guidance. An on-board memory of a vehicle is capable of storing information used in auto-guidance specific to that particular vehicle and/or a class of vehicles and passing the information through a vehicle communication network. The information is then transferred to a removable master controller and/or removable satellite positioning receiver to aid in auto-guidance of the vehicle. In this way, the master controller and/or the GPS unit may be removed and/or re-installed on a vehicle without having to store the vehicle specific information.</p>
