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.
Extra services
You can upgrade Maps with a full voice-guided navigation,
which requires a regional licence.
To use this service, you need a compatible external GPS
device that supports Bluetooth wireless technology.
To purchase a navigation service with voice guidance,
select Menu > Maps > Extra services > Purchase
navigation, and follow the instructions.
To use navigation with voice guidance, you must allow the
Maps application to use a network connection.
The navigation licence is connected to your SIM card. If you
insert another SIM card in your phone, you are asked to
purchase a licence when starting navigation. During the
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