How GPS works.

[Guest bunkerdave]

I am sure most of us have an idea of how our little friends do their work, but I came across a tutorial that tells more than most of us ever dreamed of knowing. It was very informative for me, esp. the parts about WAAS, and I thought the rest of the Geocaching world would like it.

 

It starts here:

 

http://www.trimble.com/gps/howgps/gpsfram1.htm

 

It is pretty long if you go through all of it, but it is in sections, so you can pick the ones you are curious about.