Trimble Tutorial & The GPS Revolution.

I found both of these articles very interesting. For the first time i actually understand how the GPS system works. I find it fascinating how many different ways the satellites and receivers can make corrections for tremendous accuracy. The GPS Revolution was a nice read because it is a quick overview of GPS and it's history while the Trimble Tutorial is much more indepth and informative. Overall they work very well as a one two punch of explaining the whole GPS process. What I found most interesting is the triangulation of points and how it can be achieved two ways. One by three precise measurements or by using four satellites that don't have to be as accurate.