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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
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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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