What is global positioning system? (GPS)

What is the minimum number of satellites that enables a Global Positioning System (GPS) receiver to determine one's longitude/latitude position, i.e., to make a 2D position fix.

Which state government approved mandatory Global Posititioning System (GPS) in all public transport vehicles from June 2015?

Name the three major segments of global positioning system.

What is global warming?

What is global warming?