An x-y coordinate system, with the origin at 0° latitude and 0° longitude
The global grid helps me see where the prime merdian is
No
The definition of global grid is a grid that covers the whole Earth.
Locations
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The Equator and Prime Meridian
A global grid uses a system of lines of latitude and longitude which allows you to locate any place on Earth with a simple number code and a map grid uses a a system of imaginary to divide up space on a map and you could locate a place that is either in or local to what place the map is representing.
They both allow you to locate a place on either a world map or a globe.
66.5622 degrees north latitude
finding locations by using latitude and longitude
area distance shape direction scale
360