268APPENDIXIS350/250_Navi_U(L/O 0607)This navigation system calculates thecurrent vehicle position using satellitesignals, various vehicle signals, mapdata, etc. However, the accurate posi-tion may not be shown depending onthe satellite condition, road configura-tion, vehicle condition or other circum-stances.The Global Positioning System (GPS) de-veloped and operated by the U.S. Depart-ment of Defense provides an accurate cur-rent vehicle position using 3 to 4 satellites.The GPS system has a certain level of in-accuracy. While the navigation system willcompensate for this most of the time, occa-sional positioning errors of up to 300 feet(100 m) can and should be expected.Generally, position errors will be correctedwithin a few seconds.When your vehicle is receiving signalsfrom the satellites, the "GPS" mark ap-pears at the top left of the screen.The GPS signal may be physically ob-structed, leading to inaccurate vehicleposition on the map display. Tunnels, tallbuildings, trucks, or even the placement ofobjects on the instrument panel may ob-struct the GPS signals.The GPS satellites may not send signalsdue to repairs or improvements beingmade to them.Even when the navigation system is re-ceiving clear GPS signals, the vehicleposition may not be shown accurately orinappropriate route guidance may occur insome cases.NOTICEThe installation of window tintingmay obstruct the GPS signals. Mostwindow tinting contains some metal-lic content that will interfere with GPSsignal reception. We advise againstthe use of window tinting on vehiclesequipped with navigation systems.Limitations of the navigation system
