Here's how you can use the Google Maps application in fullscreen on the iPad

  IERI (Yesterday) the Google Maps application for iOS was launched in the App Store, extremely many users were happy to see it in the Apple store, but unfortunately it was designed to work natively only on the iPhone/iPod Touch. Google has promised to release a version for iPad in the near future, but until then the application can only be used in 2x modes on the tablet. Although that mode at least gives you the opportunity to run the application decently, the tweaks RetinaPad si Full force I will allow you to display the application on the entire screen of the iPad tablet.

  Unfortunately the tweaks must be installed from Cydia, so you have to do it first jailbreak, but if you have a jailbroken tablet on iOS 5.x, then you will be able to run the application without problems. It is not known when Google will release a native iPad version of Google Maps, so for now this is the best alternative for those who have jailbroken tablets.