2011 Lexus IS 350 Navigation Manual - Page 349

APPENDIX (a) Accurate current vehicle position may not be shown in the following cases: D When driving on a small angled Y− shaped road. D When driving on a winding road. D When driving on a slippery road such as in sand, gravel, snow, etc. D When driving on a long straight road. D When motorway and surface streets run in parallel. D After moving by ferry or vehicle carrier. D When a long route is searched during high speed driving. D When driving without setting the current position calibration correctly. D After repeating a change of direction by going forward and backward, or turning on a turntable in the parking lot. D When leaving a covered parking lot or parking garage. D When a roof carrier is installed. D When driving with tire chains installed. D When the tires are worn. D After replacing a tire or tires. D When using tires that are smaller or larger than the factory specifications. D When the tire pressure in any of the four tires is not correct. INFORMATION If your vehicle cannot receive GPS signals, you can correct the current position manually. For information on setting the current position calibration, see page 313. (b) Inappropriate route guidance may occur in the following cases: D When turning at an intersection off the designated route guidance. D If you set more than one destination but skip any of them, auto reroute will display a route returning to the destination on the previous route. D When turning at an intersection for which there is no route guidance. D When passing through an intersection for which there is no route guidance. D During auto reroute, the route guidance may not be available for the next turn to the right or left. D It may take a long time to operate auto reroute during high speed driving. In auto reroute, a detour route may be shown. D After auto reroute, the route may not be changed. D An unnecessary U−turn may be shown or announced. D A location may have multiple names and the system will announce one or more. D Some routes may not be searched. D If the route to your destination includes gravel, unpaved roads or alleys, the route guidance may not be shown. D Your destination point might be shown on the opposite side of the street. D When a portion of the route has regulations prohibiting the entry of the vehicle that vary by time or season or other reasons. D The road and map data stored in your navigation system may not be complete or may not be the latest version. 373