do apps that use gps on an iphone 3gs, like garmin, use your data/3g network to...

MVP1

New member
...operate? basically i bought an app for my iphone that uses gps (cycling app). i pretty sure the answer to my question is yes, but when im using the app which is using gps, it requires 3g or whatever, which in turn costs me money? (i dont have a data plan) someone please clarify?
 
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