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Walking or driving very slowly may also
substantially reduce GPS performance.
Even where location information can be
calculated in such situations, it may take much
longer to do so, and your location estimate may
not be as accurate.
Even where adequate signals from multiple
satellites are available, your GPS feature will only
provide an approximate location, often within 45
meters (150 feet) but sometimes much further
from your actual location. Advice on how to
improve GPS performance is provided in
"Enhancing GPS Performance" on page 163.
While the GPS feature of your handset can be a
valuable navigational aid, it does not replace the
need for careful navigating and good judgment.
Never rely solely on one device for navigation.
Remember that the accuracy of the location
information and the time needed to obtain it will vary
depending on circumstances, particularly the ability
to receive signals from adequate numbers of
satellites.
The satellites used by the GPS feature of your
handset are controlled by the U.S. government and
are subject to changes implemented in accordance
with the Department of Defense GPS user policy and
the Federal Radionavigation Plan. These changes
may affect the performance of the GPS feature of
your handset.
Making an Emergency Call
Dial 911 to be connected to an emergency response
center. If you are on an active call, you must end it
before calling 911.
When you make an emergency 911 call, the GPS
feature of your handset begins to seek information to
calculate your approximate location. It will take the
GPS feature of your handset some time to
determine your approximate location. Even where
your handset has good access to sufficient GPS
satellite signals and network assist data, it may take
30 seconds or more to determine the approximate
location. This time will increase where there is
reduced access to satellite signals. When your
approximate location is determined, it is made
available to the appropriate emergency response
center.
Making an Emergency Call
161
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