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Discuss [iPhone 3G] GPS functionality.. ? at the iPhone 3G - Hackint0sh.org; Steve talked about the A GPS. The system works like Cell Tower> WIFI > and ...
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    Default [iPhone 3G] GPS functionality.. ?

    Steve talked about the A GPS. The system works like Cell Tower> WIFI > and last GPS satellite. What is the advantage of this order of operation? Why not always route using GPS satellites like (tom tom) and later if no signal attempt the Cell towers and WIFI? Anyone with more technical understanding?

    Please post the concepts............
    iPhone 8GB - $249 Refurbished



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    It's actually GPS satellite > Wifi > Cellular towers.
    Click Here for details.

    Watching the demo, I don't see turn by turn voice prompt at all. I guess we have to look.

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    Actually, its the other way around. Phone first searches for GPS signal, then WIFI, and then Cell Tower. Read about it here: http://www.apple.com/iphone/features/gps.html under 'Get the signal' heading.

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    Regular GPSs take a few minutes to initialize because they need to start from scratch each time, essentially. They have no prior knowledge of the satellites they should be looking for other than a last known location.

    The new iPhone's GPS uses cell tower triangulation first so it can get a fix much faster than your average GPS unit.

    A-GPS initially sounds like a half-baked implementation, but it's actually better.

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    AGPS is better if you have cell tower coverage and if you're not in airplane mode.

    I'd really like to be able to use the GPS at times when I don't have cell tower coverage.

    Anyone know if it's possible to get the GPS to work without the assist part of the package? Can you use the GPS when you can't talk to the cell system?

    A corollary to this... Is there a way to download static maps to the system and then get the GPS to show you your position on those static maps?


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    Quote Originally Posted by twinotter View Post
    AGPS is better if you have cell tower coverage and if you're not in airplane mode.

    I'd really like to be able to use the GPS at times when I don't have cell tower coverage.

    Anyone know if it's possible to get the GPS to work without the assist part of the package? Can you use the GPS when you can't talk to the cell system?

    A corollary to this... Is there a way to download static maps to the system and then get the GPS to show you your position on those static maps?
    AGPS without cell service is regular GPS. I have personally used GPS with no sim card in the phone and wifi off. It works perfectly.

    Maybe you'd get the right answer if you tried it for yourself.

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    Actually I have tried it myself. I'm unable to get the GPS to lock while flying in an airplane. Not sure what the difference is with your setup... did you start with a cell/wifi connection in order to initialize the gps?

    And that doesn't really answer the second part of the question, which I've also searched for... I'd like to find a way of using maps + gps without cell/wifi service.

    Thanks,
    twinotter

 

 

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