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Global Positing Satellite system (GPS)

This is a huge subject, and many pages cover it well. Simply put, for about $100 or up to whatever you want to pay, you can buy a small, usually hand-held, device that uses a system of satellites to tell you exactly where you are, with an accuracy of less than 20 feet in most cases. These are a few links to helpful information, if you would like to know more. Some of these are commercial sites, but they have useful information in the midst of their sales material.

http://gpsinformation.net/exe/waas.html

http://www.garmin.com/aboutGPS/

http://travel.howstuffworks.com/gps.htm