Still, the application is technically in beta phase, in reality it is pretty great and little to no bugs. So as long as users live in one of the three countries above now they can take access of the full turn-by turn voice guided navigation, offline maps, speed limit warnings and other conveniences like as day and night modes.
Nokia Drive + is the biggest advantage for the Nokia Lumia lineup over WP Smartphone’s from other manufactures, so this might have a important impact on the balance of power in the Microsoft platform. Users can download this Nokia Drive+ from the official Windows Phone website. Till now there is no information about its availability in other countries.
source : GSMArena