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Section 2F. Tools 123
ⅷ In temperature extremes outside the operating limits
of your phone.
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.
Therefore, in any 911 call, always report the location to
the emergency response center if you can and if you
cannot, remain on your phone for as long as the
emergency response center instructs you.
Even where adequate signals from multiple satellites
are available, your GPS feature will only provide an
approximate location, often within 150 feet (45 meters)
but sometimes much further from your actual location.
Advice on how to improve GPS performance is
provided in “Enhancing GPS Performance” on
page 125.
While the GPS feature of your phone 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.
On emergency calls, your phone uses assistance
information from the phone network to improve the
speed and accuracy of your phone’s location
calculation. If such assistance information becomes
unavailable, it may reduce the speed and accuracy of
the location calculation.
The satellites used by the GPS feature of your phone
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
phone.
Making an Emergency Call
Dial 911 and press O 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 phone begins to seek information to