2003 Toyota Prius Navigation Manual - Page 56

Orientation of the map You can change the orientation of the map from North-up to Heading-up by touching the direction 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 the 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 built in for security reasons. While the navigation system will compensate for this most of the time, occasional positioning errors up to 300 feet can and should be expected. Generally, position errors will be corrected within a few seconds. 1UE085 1UE086 49