What Is the Global Positioning System (GPS)

Multiple Choice

What is the global positioning system (GPS) ?

A) a system for determining positions on the Earth by careful observations of the Sun and stars
B) a system of determining positions on the Earth by receiving radio signals from many ground-based beacons
C) a system for determining positions on Earth using signals from a set of satellites in Earth orbit
D) a term used to refer to any type of celestial navigation