Not positive, because with my phone, if I don't have wifi, it connects via a data connection. It will use the GPS to find places near, and you can find anything from Sani-dumps to Walmarts, and all types of campgrounds, plus way more stuff if you want.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln
I have Allstays on my tablet (no cellular capability). With wifi enabled, Allstays shows me a map with pins representing locations; I can click on a pin and view info about that CG, Walmart, or whatever.
If I turn off wifi, Allstays pins are visible, but no map. So it's harder to tell where the pins are... not impossible though, you just have to click on a pin and see what it says to find out where it is. Sort of like stumbling around in the dark and finding a flashlight.