2009 Toyota Avalon Navigation Manual - Page 47

BASIC FUNCTIONS When your vehicle is not receiving signals from the satellites, the "GPS" mark does not appear at 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 GPS satellites may not send signals due to repairs or improvements being made to them. Even when the navigation system is receiving good GPS signals, the vehicle position may not be shown accurately or inappropriate route guidance may occur in some cases. NOTICE The installation of window tinting may obstruct the GPS signals. Most window tinting contains some metallic content that will interfere with GPS signal reception of the antenna in the instrument panel. We advise against the use of window tinting on vehicles equipped with navigation systems. (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 spiral 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 freeway 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 directions 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 the 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 the information on setting the current position calibration, see page 95. 59