Here's how you can install Google Maps on your iPhone, iPad or iPod Touch home screen in iOS 6.
1. Open the Safari app.
2. Go to maps.google.com.
3. Tap the arrow at the bottom of the screen.
4. Tap "Add to Home Screen."
5. A menu will appear, type in the name you want for your icon then tap the Add button.
6. The new Google Maps icon will appear on your home screen.
Now you can launch Google Maps on your iPhone, iPad or iPod by tapping the new Google Maps icon. This is a very easy way to substitute Google Maps for Apple Maps on all of your iOS 6 devices.