Gray, Leon                  <br/><br/>
How does GPS work?  
Leon Gray 
 - New York, N.Y.  Gareth Stevens Publishing  2014 
 - 48 pages   color illustrations, color maps   29 cm. 
 - High-tech science . <br/><br/>What is GPS? -- GPS and the military -- GPS navigation -- Mapping the world -- GPS safety -- Tracking technology. 
<br/><br/> Describes what GPS is, its beginnings as a military system, and its many modern uses, such as catching criminals, predicting earthquakes, and creating maps. 
<br/><br/> 9 - 12 years 
<br/><br/><label>ISBN: </label>9781482403930 9781482403947 (pbk.) 9781482403930 
<br/><br/><label>LCCN: </label>2014415065 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Global Positioning System
<br/><br/><label>Index Terms--Genre/Form: </label>
<br/><br/><label>Dewey Class. No.: </label>j910.285 Gra   29