From Planetary Scale: Mappity San Francisco Bay Area is a complete map of the San Francisco Bay Area for your iPhone or iPod Touch. It includes street-level detail for San Francisco, Oakland, San Jose, and Palo Alto. The entire map is stored on your iPhone or iPod Touch. It features location crosshairs similar to the built-in Maps application, street level map detail for the whole Bay Area, and custom mapping based on open street map data.
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