Google Maps travel time accuracy: How exactly does it know the distance and time of your trip

Google Maps estimates travel time using a blend of technology and data. It calculates distance, considers speed limits, and ...
Not What You Think Official on MSN

How GPS Really Works (and What Happens If It Fails)

Every GPS fix starts with satellites broadcasting the time, and your phone calculating distance at the speed of light. Four satellites give you a precise point on Earth, but even the tiniest timing ...