Question: The IERS Reference Meridian (IRM), is the prime meridian (0° longitude) maintained by which organization, it is also the reference meridian of the Global Positioning System (GPS), originally Navstar GPS, is a space-based radionavigation system owned by the United States government and operated by the United States Air Force?
Sentence (from "Global Positioning System"): It is a global navigation satellite system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites.
Relevant evidence: No