2012 Toyota Prius Navigation Manual - Page 142

5. GPS (GLOBAL POSITIONING SYSTEM) INFORMATION ● This navigation system uses tire turning data and is designed to work with factory-specified tires for the vehicle. Installing tires that are larger or smaller than the originally equipped diameter may cause inaccurate display of the current position. The tire pressure also affects the diameter of the tires, so make sure that the tire pressure of all 4 tires is correct. 3 NAVIGATION SYSTEM 127 PRIUS v (US) NAVI 47675U 11.09.08 12:54