Nokia N95

Page 71
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Positioning
71
Positioning
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, such as the GPS receiver in your device, 
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 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.
GPS should only be used as a navigation aid. It should not 
be used for precise location measurement and you should 
never rely solely on location data from the GPS receiver for 
positioning or navigation.
Your device also supports Assisted GPS (A-GPS).
Assisted GPS (A-GPS) uses a packet data connection to 
retrieve assistance data to improve GPS performance. It 
decreases the time to calculate the current location of 
your device 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 A-GPS, press 
, 
and select 
Tools
> 
Settings
> 
General
> 
Positioning
> 
Positioning server
> 
Access point
. A WLAN access point 
cannot be used for this service. The packet data internet 
access point is asked when GPS is used for the first time in 
your device.
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