Nokia N97 - Manual (Page 63)

The trip meter has limited accuracy, and rounding errors may
occur. Accuracy can also be affected by availability and quality
of GPS signals.
The coordinates in the GPS are expressed using the
international WGS-84 coordinate system. The availability of
the coordinates may vary by region.
About assisted GPS (A-GPS)
Your device supports A-GPS (network service). 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.
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.
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.
Define an access point for A-GPS
Select Menu > Applications > Location and Positioning >
Positioning server > Access point . Only a packet data
internet access point can be used for this service. Your device
asks for the internet access point when GPS is used for the
first time.
Tips on creating a GPS connection
Check the satellite signal status
Select Menu > Applications > Location and GPS data >
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 your
location, the color of the bar changes.
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 your location with three
satellites. However, the accuracy is generally better when
more satellites are found.
If no satellite signal can be found, consider the following:
•
If you are indoors, go outdoors to receive a better signal.
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