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I use Gaia heavily for backcountry travel - i.e. on foot. I've tried to use it in the car and didn't like it. Something like OnX Offroad is definitely more vehicle focused. Yes they need cell service, unless you've downloaded areas local to you for offline use. I have most of California south of Tahoe downloaded in Gaia and I think its only about 10GB of storage used on my phone.
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