I don't have to tell you how helpful Google Maps is, but using Google Maps on your iPhone can be tricky if you're in a WiFi or 3G deadzone. So what to do if you've veered off course and can't get a signal? Plan ahead and use GmapCatcher before you leave. This tool allows you to save and download maps from Google (and a few others like Yahoo Maps), and pull them up offline, so you're never without directions. Just download the plug-in, and it will work just fine on your Windows, Linux, and Mac devices. Of course, you could always pull over and ask how to get to your final destination, but hey, who wants to do that!?
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