Active GPS and get coordinates

Hello everyone,
First of all i must say i newbie with Unity
and apologize ahead for my english.
So here is the deal, My goal is to create a real map of world a 2d something like Google maps or Online maps.
and get gps location and point a user on the map according to these gps coordinates.
For begging I tried to get gps coordinates and just display text on the screen , Unfortunately i haven't succeed ,
I am programming from my pc, my questions is how i can work with GPS and get coordinates when my PC dont have a gps service, if some one can help me with my main goal or my secondary " ill be glad ! please help , thanks alot guys !