Nobody took the time to go on ftp and read all you can know about Gps Agps (conventional and qualcomm one ) The qualcomm technologie use Gps and in very bad signal area go to agps that help to be more precise than with just gps. Dont forget that it's not a SIRF 3. Standard Agps in telecom. mean that all the signal come from the cell tower. In the case of qualcomm Agps mean gps + cell tower signal.....
Go for a crash course on the ftp ther is nothing complicate... If everybody go read before asking we will all talk about the same thing cause we are a lot of divergent opinion on that topic in this Forum
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