> i want to know what we can do?
I don't know you, what can you do ?

The Raspberry Pi on the other hand can do (almost)
everything. But It's the details that decide if it will be easy/hard and cheap/expensive.
But obviously you will not be able to draw a map on a 16x2 character LCD display.
So if your question boils down to "Can you read a posision from a GPS and show the address of that location on an LCD display." then the answer is yes. ( but with the pre-requisite that is has internet so it can use Googles GeoLocation API )
If you have a screen then you can run full car navigation software if you want.
http://libresmartphone.com/navigation-s ... pberry-pi/