2005 Lexus GX 470 Navigation Manual - Page 10

BASIC FUNCTIONS Even when the navigation system is receiving clear GPS signals, the vehicle position may not be shown accurately or inappropriate route guidance may occur in some cases. (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. When your vehicle is receiving signals from the satellites, the "GPS" mark appears at the top left of the screen. The GPS signal may be physically obstructed, leading to inaccurate vehicle position on the map display. Tunnels, tall buildings, trucks, or even the placement of objects on the instrument panel may obstruct the GPS signals. The installation of window tinting may also obstruct the GPS signals. Most window tinting contains some metallic content that will interfere with GPS signal reception. We advice against the use of window tinting on vehicles equipped with navigation systems. The GPS satellites may not send signals due to repairs or improvements being made to them. D When driving on a long straight road. D When freeway and surface streets run in parallel. D After moving by ferry or vehicle carrier. D When a long route is searched during high D D D D D D D D speed driving. When driving without setting the current position calibration correctly. After repeating a change of direction by going forward and backward, or turning on a turntable in the parking lot. When leaving a covered parking lot or parking garage. When a roof carrier is installed. When driving with tire chains installed. When the tires are worn. After replacing a tire or tires. When using tires that are smaller or larger than the factory specifications. 10