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"Assisted GPS" isn't just using cellphone towers to determine location. It's when a device (usually a mobile phone) has the necessary GPS hardware to listen to GPS signals, but not process them itself into an actual location. So instead they utilize a server to help them quickly determine what satellites are visible in their area, and then process the data captured by the device. So it's still generating coordinates based on GPS information, but not all the processing is done by the device.
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