To find these caches you go to a web site like Geocaching.com. You get the GPS coordinates of a cache you would like to visit. You plug the coordinates into your GPS receiver and then drive or hike to ...

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, which ...

The Coast Guard hacked this system with Differential GPS, forcing the U.S. to finally unlock full accuracy for civilians in 2000. Today, GPS isn’t just about directions—it’s the master clock for banks ...