I believe that Gmaps is some sort of value added program that offers certain utilities, but still depends on the google map database.
If the OP asks a more specific question about one or more of the Gmap features then we might be able to answer.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.