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You say, "if you're going to take a long trip, you may need multiple memory cards to hold the maps. Which also means that you can't plot an entire long route in one shot, a shortcoming shared with other products, and mostly a factor of memory limitations rather than design issues."
I agree with your statement overall, but note that Pharos has developed four additional "US Highway Maps" that were not on my CD's (but may be on the CD's for the latest version.). You download them free from the Pharos site. They are in effect Interstate highway grids for the four quadrants of the US. They have no other information on them, but they allow you to stitch together a path across multiple states by only using three maps--a detailed map on each end, and the Interstate map in the middle.
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