Off Line GPS Data question

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http://androidforums.com – I have a pretty specific question for offline GPS users. I have an S3 with Canadian carrier FIDO. I do not have a data package, as the boss at home says I don't need it. :) (I'm still working on her) I have installed the Sygic NA offline GPS app, and it works great. I am driving to the warmer climate with the family for the kid's spring break, and was thinking it might be a good idea to have live traffic reports. FIDO offers a prepaid data package for the US of 20M for $30. It is steep enough, but would it be enough data to take care of traffic, weather and maybe the a few searches for thin (General)