128
GPS Enabled
• Some radios, entertainment eq uipment and
other electronic de vices may generat e
signals that can block or interfere with the
GPS receiver abilit y to receive the distant
satellite signals, par ticularly when su ch
devices are operating in close proximity to
the GPS receiver. Therefore, in a 911 call, or
when otherwise using the GPS location
function, always m ove your phone away
from any such devices.
• When your GPS an tenna is covered (for
example, by your hand or other object) or
facing the ground
• In temperature ext remes outside the
operating limits of your phon e
Walking or driving very sl owly may also
substantially reduce GPS p erformance.
Even where location in formation 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 c an and if you cannot,
remain on your phone for a s long as the
emergency respon se center instructs you.
Even where adequate sign als from multiple
satellites are available, your GPS feature w ill
only provide an approxim ate 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 Pe rformance” on
page 131.
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 accurac y of the location
information and the time needed to obtain it w ill
vary depending on circumstances, particularly the
ability to receive si gn al s f rom ad eq uate nu mb ers o f
satellites.
On emergency calls, your phone uses assistance
information from th e phone network to im prove the
speed and accur acy of your phone’s location
calculation: if such assistance information
becomes unavailable, i t may r ed uce t he sp eed a nd
accuracy of the locatio n calculation.