# data[].attributes.body
The GPS has 3 parts that allow it to function. They are the space segment, ground segment (also called control segment), and the user segment.

# data[].attributes.body
The space segment consistes of the satelites that rotate the Earth. The ground segment consists of control stations that interact with the satelites and recivers. The user segment is the recivers which would be in planes, ships, phones, etc.

# data[].attributes.body
The satelite is able to detect where the reciver is, and tells the control center how far it is from the reciver. The mesurement could be many places, but there is information from many satelites that gives the control center a near exact measurement that gets sent to the reciever.

# data[].attributes.body
Schriever Air Force Base
Wikimedia Commons
"The Global Positioning System." The Global Positioning System, 1997, pp. 1-15. SIRS Discoverer, http://discoverer.prod.sirs.com.