Thread: iPhone app that records GPS periodically?
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Old 04-18-13 | 08:21 PM
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Burton
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From: Montreal, Quebec
Originally Posted by cplager
Why do you need to have signal to get a GPS reading?
Because 3G iPhones don't use direct GPS - they use A-GPS; short for 'assisted GPS'. That makes them dependent on alternate sources like WiFi and cellular networks.
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