How does the map know where I am exactly

Ok I click on map and find my location and exactly correct it knows my location. Even though the ip address is located in another state. Wondering how it knew the location.

It uses the registered addresses of the wi-fi routers that it can see.
From the manual:
"iPod touch uses location services to determine your location. Location services uses available information from local Wi-Fi networks (if Wi-Fi is turned on). "
http://manuals.info.apple.com/enUS/iPod_touch_iOS4_UserGuide.pdf

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    As Ashish pointed out, communication structure contains fields (infoobjects) that suppose to go to data targets. Which IO in CS to which IO in the data target will go (and what transformation of data may occur) is determined in URs of the data target.
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    a)     Under “Transfer_Structure/Transfer_Rules” in the InfoSource
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    A: Yes, you are right.
    Q: The left column (Transfer Structure), in my test was exactly the same as on the right. Where do these fields eventually go?
    A: As I described, left and right parts are identical. These fields will go to CS.
    Q: b) Under “Communication_Struct.”, in the InfoSource
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    A: these are fields from an IS template, the name of this template you can see above this right part.  Actually, during IS (CS) creation you can choose different templates and choose fields from them transferring them into the left part.
    Q: 4. The left column is “Communication Structure”, which at this point has no InfoObjects, if I move a couple of InfoObjects from the right to the left, where do these Objects in the left eventually go?
    A: these are fields of CS (left part) and as I said before they will go to data target.
    Q: 5. what is the relationship between the “Communication Structure” in 4 and 1? Or any relationship between a) and b) as a whole?
    A: CS in 4 just shows IOs that will be transferred to data target. CS in 1 also shows how values for CS IOs are to be fed and transformed.
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    Eugene
    Message was edited by: Eugene Khusainov

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