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I'm sure they're improving them all the time, but the 128 meg chip on mine holds detailed maps of all of California, Nevada, and anywhere else I thought my car would be going. The unit comes pre-loaded with all of North America in it, but only the major roads. So you're never lost, no matter how far you drive. But if you want to know where all the restaurants are, and you're in Denver or something, then you'd have to bring the laptop, or get a memory stick that's got more storage.
If you're going to want to use it for hiking or biking, then the smaller unit (like Don's) is probably a smarter way to go. The streetpilot isn't big, but it's not pocket size. And its batteries probably last a shorter time than the smaller ones.
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