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A brief description of how GPS Receivers and trilateration work. From HowStuffWorks.com.
Monitoring the Earth's surface using GPS (Global Positioning System) technology, providing quantitative data of changes in position and rates of change.
Describes pretty much everything you might need to know about GPS in quite a lot of detail.
Online exhibitions about flight including Apollo to the Moon, Milestones of Flight, How Things Fly, Business Wings, Space Race, Exploring the Planets, GPS etc
Galileo is Europe's own global navigation satellite system. This page explains how it works and why Europe needs it.
Use the GPS (Giant Penguin Slingshot) to launch Kevin the penguin back on to his space ship. A fantastic game to illustrate projectile motion and the effects of gravity.