Program 11, Episode 301

How It Works

Trying to figure out where you are and where you're going has always been a challenge. Navigation and positioning are crucial to so many activities and yet the process has not always been easy. Thankfully, the days of navigating by celestial means or landmarks are long gone since the introduction of GPS, or the Global Positioning System. You can buy a GPS receiver just about anywhere, or you can have it installed in most new cars.

Johnny Alonso found out how this unique device works.

Additional Information
http://www.nasm.si.edu/galleries/gps/work.html