I am sure you definitely need a GPS app for your android phone when you are out of home. You may wander that: the phone gets the GPS by itself. But Phone based GPS apps are really better than personal navigation devices. For Phone based GPS systems have the ability to do much more complex tasks that would be impossible without a wireless data network. Below are some of the location based apps recommended for android phone.(tip: if you are interested in these apps, you can click the blue words to download)
1 Google Maps Navigation

Google Maps with navigation is available for Android 1.6 and higher. This suite has proven itself and is currently the most popular GPS app for Android 1.6 users and above. It includes many features that no other GPS apps are able to provide, such as Street View and Satellite views.You can also view detailed maps with 3D buildings, use the voice guided turn-by-turn GPS navigation.