Do you use Google Navigation turn-by-turn directions often? You will need an address book to add your common locations.
Introduce your locations or get it from the GPS and click one of them to start to navigate or show it in a map.
Try the lite version and check if it is what you need. Navigation Book Pro is the cheapest and easy to use app on Android Market to save all your locations to the address book and navigate using Google Navigation.
Keywords: Navigation, GPS, locations, turn-by-turn, navigator.