Nokia N900 User Manual page 77

The trip meter has limited accuracy, and rounding errors may
occur. Accuracy can also be affected by availability and quality
of GPS signals.
Different positioning methods can be enabled or disabled in
positioning settings.
Assisted GPS (A-GPS)
Your device also supports assisted GPS (A-GPS).
A-GPS requires network support.
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. You can define the access point for
A-GPS in network positioning settings. 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 you
to select the internet access point when GPS is used for the
first time.
Related topics
See "Location settings ," p. 78.
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Hold your device correctly
When using the GPS receiver, ensure you do not cover the
antenna with your hand.
Establishing a GPS connection may take from a couple of
seconds to several minutes. Establishing a GPS connection in
a vehicle may take longer.
The GPS receiver draws its power from the device battery.
Using the GPS receiver may drain the battery faster.
Position requests
You may receive a request from a network service to receive
your position information. Service providers may offer
information about local topics, such as weather or traffic
conditions, based on the location of your device.
When you receive a position request, the service that is
making the request is displayed. To allow your position
Find and view locations 77