Yah, the problem is you have to download the maps to the Tablet...
GPS doesn't need WiFi/cell to work, but all you'll see is the little blue dot on the Tablet unless you download maps that will show you where you are.
I have the Samsung Galaxy S2? I used to use for off roading, RZR, nav, but unless you have a connection that allows Google to keep downloading the maps, it'll be just a blue dot.
There are many maps you can download and also, Google allows you to download just in case you loose cell/internet coverage. It's just you'll need to stay on top of it.
I link the tab to my Verizon Jetpack.
Garmin of course downloads all the maps, some 6gig or so, when it does updates so you don't need the internet connection...
Hope that helps..