iPhone - Google Maps

The iPhone can to access a specially modified version of Google Maps — in map, local list, or satellite form, optimized for the iPhone. During the launch of the product, Jobs demonstrated this feature by searching for nearby Starbucks and then placing a prank call to one with a single tap.

With the iPhone 3GS, you can find your location quickly and accurately via GPS, Wi-Fi, and cellular towers and drop a pin to mark your location or share it with others via email or MMS.

The iPhone 3G S will let you view a list of turn-by-turn directions or follow a highlighted map route and track your progress with GPS.  With the iPhone 3GS. you can specify if you’d like walking or driving directions, or see what time the next train or bus leaves with public transit directions.

There is also a built-in digital compass rotates maps to always match the direction you’re facing. With the iPhone 3GS, you can also use the compass on its own