Table of Contents
Advertisement
Positioning (GPS)
About GPS
The Global Positioning System (GPS) is a worldwide
radio navigation system that includes 24 satellites and
their ground stations that monitor the operation of
the satellites. Your device has an internal GPS receiver.
A GPS terminal receives low-power radio signals from
the satellites and measures the travel time of the
signals. From the travel time, the GPS receiver can
calculate its location to the accuracy of meters.
The coordinates in the GPS are expressed in 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
© 2008 Nokia. All rights reserved.
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.
Your device also supports Assisted GPS (A-GPS).
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.
A-GPS is a network service.
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 a packet data internet access point
defined in the device to retrieve assistance data from
the Nokia A-GPS service. To define an access point for
99
Advertisement
Table of Contents
