Nokia 5800 XpressMusic User Manual

Also see for 5800 - XpressMusic Smartphone - WCDMA: Datasheet User guide Datasheet User guide Quick start guide

Contents

Nokia 5800 XpressMusic User Manual Manual pdf 63 page image

12. Positioning (GPS)You can use applications such as GPS data to calculate yourlocation or measure distances. These applications require aGPS connection.About GPSThe coordinates in the GPS are expressed using theinternational WGS-84 coordinate system. The availability ofthe coordinates may vary by region.The Global Positioning System (GPS) is operated by thegovernment of the United States, which is solely responsiblefor its accuracy and maintenance. The accuracy of locationdata can be affected by adjustments to GPS satellites madeby the United States government and is subject to changewith the United States Department of Defense civil GPS policyand the Federal Radionavigation Plan. Accuracy can also beaffected by poor satellite geometry. Availability and qualityof GPS signals may be affected by your location, buildings,natural obstacles, and weather conditions. GPS signals maynot be available inside buildings or underground and may beimpaired by materials such as concrete and metal.GPS should not be used for precise location measurement,and you should never rely solely on location data from theGPS receiver and cellular radio networks for positioning ornavigation.The trip meter has limited accuracy, and rounding errors mayoccur. Accuracy can also be affected by availability and qualityof GPS signals.Different positioning methods can be enabled or disabled inpositioning settings.Assisted GPS (A-GPS)Your device also supports Assisted GPS (A-GPS).A-GPS is a network service.Assisted GPS (A-GPS) is used to retrieve assistance data overa packet data connection, which assists in calculating thecoordinates of your current location when your device isreceiving signals from satellites.When you activate A-GPS, your device receives useful satelliteinformation from an assistance data server over the cellularnetwork. With the help of assisted data, your device canobtain the GPS position faster.Your device is preconfigured to use the Nokia A-GPS service,if no service provider-specific A-GPS settings are available.The assistance data is retrieved from the Nokia A-GPS serviceserver only when needed.You must have an internet access point defined in the deviceto retrieve assistance data from the Nokia A-GPS service overa packet data connection. To define an access point for A-GPS,select Menu > Applications > Location andPositioning > Positioning server > Access point. Awireless LAN (WLAN) access point cannot be used for thisservice. Only a packet data internet access point can be used.Your device asks for the internet access point when GPS isused for the first time.© 2009 Nokia. All rights reserved. 63