AGPS for N95 - alternatives to download via GPRS?

Question

I am running Garmin Mobile XT on my N95. It's cool. I have the following questions.
1. For Assisted GPS, what is the Positioning Server? Is it supl.nokia.com?
2. For Access point, I am given only a list of GPRS connections. Is there any way I can add my WiFi connection?
3. The amount is small, but with AGPS enabled, each time I turn on GPS, it incurs data of 1KB sent and 4KB received. I read that for other devices using AGPS or similar solutions, you can download the AGPS data using your internet connection. How do I do this for the N95?
4. How does the AGPS for N95 actually work? Does it download a set of data everytime you turn on GPS or every x number of days? If it is the latter, then I can simply enable AGPS every x number of days and disable AGPS in the interim.

Answer 1

Thanks for the explanation. If the N95 AGPS merely works in the way you have explained (i.e. AGPS just uses a distant server to do the number crunching much faster after the various satellites have been located by the internal GPS receiver), then the following conclusions can be drawn:
1. It will be activated everytime you turn on GPS and not once every x days (seems to be the case)
2. The amouht of data transmitted will be the same or similar every time (seems to be the case)
3. It will not be possible to download the AGPS data via other means beforehand.
4. Since AGPS works only AFTER the device has located the various satellites, it doesn't really help in satellite acquisition although it helps in the calculation thereafter. This means any increase in speed is marginal since I don't think it takes too long to calculate without AGPS?
I had read that in some forms of AGPS, it downloads orbital data of the satellites to enable the device to achieve a lock much faster. That is why it is possible to download the data beforehand via internet and other means, and that the device needs this updated information only once every few days and not everytime you turn on GPS.