 Hi, I'm Jan Van Sickle, and I teach the GPS GNSS course here at Penn State. Let me tell you a little bit about what GNSS means. It's the Global Navigation Satellite System. Now GPS is part of that system, but there's other constellations involved. For example, the Russian GLONASS system, the European Union Galileo system. The point is, the technology is changing fast and really quite dramatically. So, this course is about those changes. It's about, yes, the nuts and bolts of how everything works. That's true, but this is not an abstract investigation. This is practical. I'm trying to give you the tools that you need to take full advantage of this technology and use it the way that it will give you the most benefit. That's what the course is about.