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Gps using data

Of coarse GPS uses data...how else would it be able to locate you?

How much? I have no idea.

But you can most likely compare your data usage from the Settings.app before and after using the GPS.

It's not like it uses a set amount of data...there are too many variables.

Like distance...you will use more data using the GPS to drive 2 hours as opposed to 45 minutes.

It's impossible to give even a remotely accurate estimation of data usage.