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IMPORTANT: Things to Keep in Mind
If you are using your phone’s GPS feature while driving, please give full
attentiontodrivingandtotheroa
d.
Where adequate signals from multiple satellites are not available (usually
because your GPS antenna cannot establish a view of a wide area of open sky),
the GPSfeatureof your phone WILL NOT WORK. Such situations include
butarenotlimitedto:
• In underground locations.
• Inside of buildings, trains, or other covered vehicles.
• Under any other metal or concrete roof or structure.
• Between tall buildings or under dense tree-cover.
• Near a powerful radio or television tower.
• When your GPS antenna is covered (for example, by your hand or
other object) or facing the ground.
• Temperature extremes outside the operating limits of the 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 the
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 120.
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 the phone’s location calculation:
if such assistance information becomes unavailable, itmay reduce the speed and
accuracy of the location calculation.