Nokia 5800 - Manual (Page 62)

12. Positioning (GPS)
You can use applications such as Maps and GPS data to find out your location or measure
distances and coordinates. These applications require a GPS connection.
About GPS
The coordinates in the GPS are expressed in the degrees and decimal degrees format
using the international WGS-84 coordinate system.
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
data can be affected by adjustments to GPS satellites made by the United States
government and is subject to change with the United States Department of Defense civil
GPS policy and the Federal Radionavigation Plan. Accuracy can also be affected by poor
satellite geometry. Availability and quality of GPS signals may be affected by your
location, buildings, natural obstacles, and weather conditions. The GPS receiver should
only be used outdoors to allow reception of GPS signals.
Any GPS should not be used for precise location measurement, and you should never
rely solely on location data from the GPS receiver and cellular radio networks for
positioning or navigation.
To enable or disable different positioning methods, select Menu > Applications >
Location and Positioning > Positioning methods.
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 over a packet data connection,
which assists in calculating the coordinates of your current location when your device
is receiving signals from satellites.
When you activate A-GPS, your device receives useful satellite information from an
assistance data server over the cellular network. With the help of assisted data, your
device can obtain 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 service server only when needed.
You must have an internet access point defined in the device to retrieve assistance data
from the Nokia A-GPS service over a packet data connection. To define an access point
for A-GPS, select Menu > Applications > Location and Positioning > Positioning
server > Access point. A wireless LAN (WLAN) access point cannot be used for this
service. Only a packet data internet access point can be used. Your device asks for the
internet access point when GPS is used for the first time.
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