I've just bought a new phone that is GPS-enabled and it got me wondering, how does GPS actually work? And how accurate is it? If you've ever been walking in an unfamiliar city and got lost in a ...

At the heart of GPS is the ability to measure the distance from a receiver to several satellites. There are always 4 to 8 satellites visible at any given time. Each satellite sends out a signal ...

Alfred Leick, author of GPS Satellite Surveying and professor in the department of spatial information science at the University of Maine, provides the following answer. The Global Positioning ...