Do I Need Gprs Or Edge Connection To Use Garmin Mobile Xt?

I have a Nokia E71, which in case you’re unaware, has a internal GPS. I use T-Mobile prepaid, that means no GPRS, EDGE, or 3G… I am thinking of buying the Garmin Mobile XT for my E71, and if I have the internal GPS receiver, do I still need internet connection?
Please help!!
many thanks

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