Motorola M710 ユーザーガイド
102
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
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
Radio navigation Plan. These changes may affect the
performance of the GPS feature of your phone.
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
When you make an emergency 911 call, the GPS feature
of your phone begins to seek information to calculate
your approximate location. It will take the GPS feature
of your phone some time to determine your
approximate location. Even where your phone 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
Driving very slowly may also substantially reduce
GPS performance.
Even where location information can be calculated
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
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 114.
While the GPS feature of your phone can be a valuable
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.