This resource looks at how geologists are able to measure the movement of tectonic plates using satellite-based data and how they were able to surmise in the past that the plates were moving. It also discusses how to read GPS time-series...

GPS location apps on a smartphone can be very handy when mapping a travel route or finding nearby events. But how does your smartphone know where you are? Wilton L. Virgo explains how the answer lies 12,000 miles over your head, in an...

Students familiarize themselves - through trial and error - with the basics of GPS receiver operation. They view a receiver's satellite visibility screen as they walk in various directions and monitor their progress on the receiver's...

United States Naval Observatory is a unique observatory run by the Navy. It does some of the grunt work of astronomy -- keeping accurate time, determining positions of stars (astrometry), etc. They are responsible for publishing the...

Where are you and where are you going? Visit this site and learn the discovery and purpose of GPS, Global Position Systems.

This page offers answers to frequently asked questions regarding GPS.

Gives a basic 'course' in how GPS works.