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Helpful answers
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Sep 19, 2016 10:26 AM in response to JLocke7by Jonathan UK,Hi
GPS itself does not use cellular / mobile data.
Apps that use maps, however (including the built-in Maps app), are a different matter.
You may find the following support article helpful, including for turning off cellular / mobile data and/or roaming if desired (I suggest doing this before departure, rather than on arrival):
Use cellular networks on your iPhone and iPad while you travel internationally - Apple Support