GPS is global. There should be no difference anywhere in the world. The satellites are in north-south orbits, and cover the entire surface of the earth. The things to remember is that water and metal block GPS signals. The water in your hand will completely block them, and you can't get a good signal inside many buildings, especially ones with lots of metal, and with metallic coatings on the windows. You need to be outside with a good view of the sky.