Nokia E51

Page 83
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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 metres.
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.
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.
The trip meter has limited accuracy, and rounding errors
may occur. Accuracy can also be affected by availability
and quality of GPS signals.
To enable or disable different positioning methods, such
as Bluetooth GPS, select 
Menu
 > 
Tools
 > 
Settings
 >
General
 > 
Positioning
 > 
Positioning methods
.
About satellite signals
If your device cannot find the satellite signal, consider the
following:
• If you are indoors, go outdoors to receive a better
signal.
• If you are outdoors, move to a more open space.
• If the weather conditions are bad, the signal strength
may be affected.
• Establishing a GPS connection may take from a couple
of seconds to several minutes.
Satellite status
To check how many satellites your device has found, and
whether your device is receiving satellite signals, select
Menu
 > 
Tools
 > 
GPS data
 > 
Position
 > 
Options
 >
Satellite status
. If your device has found satellites, a bar
for each satellite is shown in the satellite info view. The
longer the bar, the stronger the satellite signal. When your
device has received enough data from the satellite signal
to calculate the coordinates of your location, the bar turns
black.
Initially your device must receive signals from at least four
satellites to be able to calculate the coordinates of your
location. When the initial calculation has been made, it
may be possible to continue calculating the coordinates of
your location with three satellites. However, the accuracy
is generally better when more satellites are found.
Positioning settings
Select 
Menu
 > 
Tools
 > 
Settings
 > 
General
 >
Positioning
.
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