the ten second review: tomtom does not use the internet except for the initial download. Pretty sure none of them use the internet extensively. When they are running the have at least 12 satellites to chat with.
Except for being completely different then the 7 GPSRs (my one fetish) I used before I kind of like the Tom tom now.
Your phone doesn't have a true GPS chip in it. It uses cell tower triangulation for GPS positioning. I just got back from a trip with my iPhone 4 and was surprised at how little cell data it used when running my GPS stuff. I didn't use any of the apps you've listed, however. We used Run Keeper and Maps. Seems like we used only a couple of MB of cell data per use. On our iPad, we're on the 250MB/Month plan We used 200 MB over 2 weeks doing light internet browsing each day, mail checking and liberal GPS work while driving and backpacking. It has a true GPS unit but requires an internet connection to download maps for the programs I use (the ones above and one called GPS Drive HD). GPS Drive worked very well but I have nothing to compare it to.
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