GPS coordinates identify the location the satellites have triangulated for you Most of us never need to use numerical GPS ...

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 ...

Bryan Roth had been hiking and scrambling for a while, with drop-offs evident around him, when his guides held out coveralls and pointed between two rocks. “We have to go in the hole,” one said. Roth ...