2009 Toyota Sienna Navigation Manual - Page 272
2009 Toyota Sienna Manual
Page 272 highlights
SIENNA_Navi_U (L/O 0807) Please be aware that all current vehicle navigation systems have certain limitations that may affect their ability to perform properly. The accuracy of the vehicle's position depends on the satellite condition, road configuration, vehicle condition or other circumstances. For more information on the limitations of the system, refer to pages 258 through 260. 2