If you need GPS its a point but if you just need 3G consider a MiFi Router with an option of a build in HCSD card Reader. You'll have your own 3G WiFi net with you and a network Storage drive up to 34GB you can use with your iPad and your Netbook, Laptop, Phone whatever you connect to your "mobile router".
My MiFi is just 3/4 of the iPhone and weights 50g.
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