GPS will only work well on a tablet if you have a dedicated (and overpriced) 3-4g data plan because of the way it's implented on tablets (and cell phones). GPS hardware on tablets doesn't work in quite the same way as it does in the dedicated GPS units made by TomTom, Garmin and Magellian for instance.
If you're in a area that doesn't have acess to either a wi-fi or 3-4G connection, you're pretty much out of luck, since from what I recall tablets use the wi-fi or 3-4g connection to download map data in chunks rather than storing the whole map for say the USA within the GPS unit itself as the dedicated units do.
This is why the dedicated GPS units don't need a wi-fi connection or 3-4g data plan to fuction, just an working uplink to the GPS sats themselves.
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