2005 Nissan Pathfinder Owner's Manual - Page 10

WHAT IS A NAVIGATION SYSTEM? ABOUT THE NAVIGATION SYSTEM This navigation system combines the data obtained from the vehicle (by gyro sensor) and from GPS (Global Positioning System) satellites to calculate the current location of the vehicle. This position is then displayed on the screen, allowing route guidance to a destination. WHAT IS GPS (Global Positioning System)? GPS is a system developed and operated by the U.S. Government, covering the entire planet. This navigation system receives three or more different radio signals from NAVSTAR (GPS satellites), orbiting the earth 13,049 miles (21,000 km) above ground. The data from different sets of signals are trigonometrically calculated to obtain the position of the vehicle. INFO: The tracking center in the U.S. controls signals transmitted from GPS satellites. This control sometimes results in reduced accuracy or no signal received at all, in accordance with government requirements. Consequently, areas such as military bases may not accurately appear on the navigation screen. INV1191 ACCURACY OF POSITIONING The color of the GPS Indicator on the upper left corner of the screen indicates positioning as follows: ● Green: positioning is possible and accurate ● Yellow: positioning is possible but accuracy is minimal ● Gray: positioning is not possible INFO: For approximately 3 or 4 minutes after system startup, the GPS indicator remains gray, even if accurate positioning is possible. 2-2 How does the Nissan navigation system work?