How we locate a point in our planet, or how to say where I am in an accurate way means that you need to understand that we live in a sphere, so messurements and coordinates need to be expressed in a perfect way using angles. That is why we need to change our daily way of mathematical thinking from decimal to sexagesimal way....
Another video that explains sexagesimal system could be seen here...
And to understand our perfect way of locate ourselves or whatsoever in our wonderfull planet here you have a nice video to explain it...