35P o s i t i o n i n g■ Add a ringing toneYou can set a ringing tone or a video ringing tone for each contact and group. Toadd a ringing tone to a contact, select > Contacts, and open the contact. SelectOptions > Ringing tone and the ringing tone. To add a ringing tone to a group,scroll right to the groups list, and scroll to a contact group. Select Options >Ringing tone and the ringing tone for the group. To remove the personal or groupringing tone, select Default tone as the ringing tone.7. PositioningYou can use applications such as Maps and GPS data to find out your location, ormeasure distances and coordinates. These applications require a GPS connection.■ About GPSThe Global Positioning System (GPS) is a worldwide radio navigation system thatincludes 24 satellites and their ground stations that monitor the operation of thesatellites.Your device has an internal GPS receiver.The Global Positioning System (GPS) is operated by the government of the United States,which is solely responsible for its accuracy and maintenance. The accuracy of location datacan be affected by adjustments to GPS satellites made by the United States government andis subject to change with the United States Department of Defense civil GPS policy and theFederal Radionavigation Plan. Accuracy can also be affected by poor satellite geometry.Availability and quality of GPS signals may be affected by your location, buildings, naturalobstacles, and weather conditions. The GPS receiver should only be used outdoors to allowreception of GPS signals.Any GPS should not be used for precise location measurement, and you should never relysolely on location data from the GPS receiver and cellular radio networks for positioning ornavigation.■ Assisted GPSAssisted GPS (A-GPS) is used to retrieve assistance data over a packet data connection,which assists in calculating the coordinates of your current location when your device isreceiving signals from satellites.Your network operator may charge you for this connection according to yournetwork subscription. Contact your service provider for the correct internet accesspoint and charges related to the service.