About positioning methods
Maps displays your location on the map
using GPS, A-GPS, or cell ID based
positioning.
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 sends you
GPS data, improving the speed and
accuracy of the positioning.
With cell ID based positioning, the
position is determined through the
antenna tower your mobile device is
currently connected to.
Depending on the available positioning
method, the accuracy of positioning may
vary from a few metres to several
kilometres.
When you use Maps for the first time, you
are prompted to define the internet access
point to use to download map
information or use A-GPS.
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
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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.