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AGPS limitations & tips
Your phone uses Assisted Global Positioning
System (AGPS) satellite signals to estimate
your location. If your phone cannot find strong satellite
signals, your AGPS might be slower, less accurate, or
it might not work at all. AGPS provides only an
approximate location, often within 150 feet
(45 meters) but sometimes much farther from your
actual location.
To improve AGPS accuracy:
• Go outside and away from underground
locations, covered vehicles, structures with
metal or concrete roofs, tall buildings, and
foliage. Indoor performance might improve if
you move closer to windows, but some
window sun shielding films can block satellite
signals.
• Move away from radios, entertainment
equipment, and other electronic devices that
might interfere with or block AGPS satellite
signals.
• If your phone has a retractable antenna,
extend the antenna.
• Hold your phone away from your body, and
point the phone antenna toward the sky. Do
not cover the antenna area with your fingers.
AGPS uses satellites controlled by the U.S.
government and subject to changes implemented in
accordance with the Department of Defense AGPS
user policy and the Federal Radio Navigation Plan.
These changes might affect AGPS performance.
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