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what is the location accuracy of wifi version ipad? If someone holds one iPad and walks in a big room, is there a way to detect the location of the iPad?

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migrated from stackoverflow.com Mar 14 '11 at 10:16

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The accuracy is going to be very poor, particularly indoors where GPS doesn't work well. –  Gabe Mar 14 '11 at 7:40
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@gabe there's not even a GPS on the wifi model –  Loïc Wolff Mar 14 '11 at 10:26

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There is no GPS in the WiFI-only iPad. The accuracy of Location Services (the part of iOS that determines where you are) is dependent on a number of factors. iOS does account for this, though:

Applications that can display your location on the screen, including Maps, indicate your current (approximate) location using a blue marker. If your location can’t be determined precisely, a blue circle also appears around the marker. The size of the circle depends on how precisely your location can be determined—the smaller the circle, the greater the precision.

(Source)

To answer your base question, though, no. There's really no way for the iPad to track fine movements (such as within a room, or even within a building) with great degrees of accuracy without the 3G model, which does include a GPS chip.

Location Services on the WiFi model is intended just to find your general location, so apps can tell you what is nearby. It isn't meant to tell you exactly where you are.

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There is a way. If there are 3 active WiFi Routers within reachable proximity, you can get WiFi triangulation that is pretty granular. No, it will never be as good as GPS, and just one access point won't pinpoint you at all, but something like a convention hall with lots of Access Point repeaters could make things pretty reliable. –  Jason Salaz Mar 14 '11 at 17:29

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