No.82
Found this and thought some of you innawoods types might be interested. Really excellent writeup of how GPS and GLONASS works. Makes me want to build a custom receiver without those silly altitude/velocity restrictions.
http://lea.hamradio.si/~s53mv/navsats/theory.html No.83
Amateur balloonists and rocketers (sorry), use two GPS receivers, each without the others restriction.
No.84
A very cool related resource.
http://www.arhab.org/ No.109