About positioning methods
Maps displays your location on the map using GPS or A-GPS.
The Global Positioning System (GPS) is a satellite-based navigation system used for
calculating your location. Assisted GPS (A-GPS) is a network service that uses local
network information to improve the speed and accuracy of the GPS positioning.
26 Maps
Downloading A-GPS data involves data transfer through your service provider’s
network. While roaming, that is, outside your service provider's network, the data
transfer charges may be higher than expected. Therefore, by default, A-GPS is not used
while roaming, but this means that calculating your location may take longer than when
using A-GPS.
To allow using A-GPS while roaming, select
Menu
>
Settings
>
Connectivity
>
GPS
>
Net-assisted GPS
. For information about data transfer charges, contact your
service provider.
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. GPS signals may not be
available inside buildings or underground and may be impaired by materials such as
concrete and metal.
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.