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I have heard that if you have the Wifi model you can use some method of determining where you are through wifi hotspots as you move around but I am not exactly sure how that works.

I also know that you can tether your iPad to a GPS through bluetooth or some manner which will give you a far more accurate reading then the assisted gps inside of the ipad.

If you have the 3g version then all you need to do is get a GPS software from the Appstore. I use the Tomtom app which is more expensive then some of the others but I find to be one of the better.
 
There are several GPS receivers for less than $100 that are designed for wifi only iPads. Try searching Amazon.
 
I already use it in my car or boat with tetering. I thought the main boards were the same, and so thought it was easy to just order an intern chip and place it.

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That is a nice bluetooth gps. But i wanted it inside the ipad. I will continue my search!
 
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