measurements of signals from nearby cellular base stations (towers) and reports the time/distance readings back to the network, which are then used to triangulate an approximate location of the card. In general, at least three surrounding base stations are required to get an optimal position fix.
Note:
AFLT accuracy is limited by the geometry of the cell towers surrounding the card requesting location information.
If you are outside you may be able to obtain an updated GPS fix more often than once an hour depending on the level of visibility.
Weather conditions may also limit your ability to acquire a GPS fix while outside.
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