I recently wrote about SimMetrics, a joint effort between MÄK and AGI, which adds high fidelity navigational accuracy to your simulation. As part of this development effort, I learned a whole lot about the GPS, and… well… navigational accuracy.
By far the most interesting source of reading is AGI’s NOG: http://thenogspot.blogspot.com/. The older posts are hosted off of AGI’s older blog site and are the most informative for a Satellite Navigation newbie: http://blogs.agi.com/navigationaccuracy. As much as my wife didn’t like it, I took most of a Saturday a few months ago and read the whole thing. Believe it or not, it was quite a bit of fun.