What would you use to determine an exact location on a map?

These days with the google earth application you can view the grid of the Earth and it will locate the exact position you are looking for with precise co-ordinates. There is also a search tab all you do is you type the name of place You are looking for. Other than that you need a GPS Gadget nowadays you can get a cellphone with a GPS unit it tells you where you are. GPS stands for Global Positioning System.