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.
When you use Maps for the first time,
you are prompted to define an internet
access point to download map
information or use A-GPS.
indicates the availability of
the satellite signals. One bar is one
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satellite. When the device is searching
for satellite signals, the bar is yellow.
When there is enough data available to
calculate your location, the bar turns
green. The more green bars, the more
reliable the location calculation.
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.
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.