2007 Toyota Sequoia Navigation Manual - Page 10

06 06.06 BASIC FUNCTIONS You can change the orientation of the map from north−up to heading−up by touching the orientation symbol at the top left of the screen. North−up symbol Regardless of the direction of vehicle travel, North is always up. Heading−up symbol The direction of vehicle travel is always up. A red arrow indicates North. Limitations of the navigation system This navigation system calculates the current vehicle position using satellite signals, various vehicle signals, map data, etc. However, the accurate position may not be shown depending on the satellite condition, road configuration, vehicle condition or other circumstances. The Global Positioning System (GPS) developed and operated by the U.S. Department of Defense provides an accurate current vehicle position using 3 to 4 satellites. The GPS system has a certain level of inaccuracy. While the navigation system will compensate for this most of the time, occasional positioning errors of up to 300 feet (100 m) can and should be expected. Generally, position errors will be corrected within a few seconds. 1U019a 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 GPS satellites may not send signals due to repairs or improvements being made to them. 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. 10