Positioning (GPS)About GPSThe Global Positioning System (GPS) is a worldwideradio navigation system that includes 24 satellitesand their ground stations that monitor theoperation of the satellites. Your device has aninternal GPS receiver.A GPS terminal receives low-power radio signalsfrom the satellites and measures the travel time ofthe signals. From the travel time, the GPS receivercan calculate its location to the accuracy of meters.The coordinates in the GPS are expressed in degreesand decimal degrees format using the internationalWGS-84 coordinate system.The Global Positioning System (GPS) is operated bythe government of the United States, which is solelyresponsible for its accuracy and maintenance. Theaccuracy of location data can be affected byadjustments to GPS satellites made by the UnitedStates government and is subject to change withthe United States Department of Defense civil GPSpolicy and the Federal Radionavigation Plan.Accuracy can also be affected by poor satellitegeometry. Availability and quality of GPS signalsmay be affected by your location, buildings, naturalobstacles, and weather conditions. The GPS receivershould only be used outdoors to allow reception ofGPS signals.Any GPS should not be used for precise locationmeasurement, and you should never rely solely onlocation data from the GPS receiver and cellularradio networks for positioning or navigation.Your device also supports Assisted GPS (A-GPS).Assisted GPS (A-GPS) is used to retrieve assistancedata over a packet data connection, which assists incalculating the coordinates of your current locationwhen your device is receiving signals fromsatellites.A-GPS is a network service.Your device is preconfigured to use the Nokia A-GPSservice, if no service provider specific A-GPS settingsare available. The assistance data is retrieved fromthe Nokia A-GPS service server only when needed.You must have a packet data internet access pointdefined in the device to retrieve assistance datafrom the Nokia A-GPS service. To define an accesspoint for A-GPS, press , and select Tools >Settings > General > Positioning >Positioning server > Access point. A wireless LAN 57 Positioning (GPS)
