Nokia E71 - About positioning methods

background image

About positioning methods

Maps displays your location on the map using GPS, A-GPS, or

cell ID based positioning.

© 2010 Nokia. All rights reserved.

70

background image

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 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.